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Motorways are, no doubt the safest roads in Britain. Mile (21) mile, vehicle for ve hicle, you arc much (22) likely to be killed or seriously injured than on an ordinary road. On (23) hand, if you do have a serious accident on a motorway, fatalities are much more likely to (24) than in a comparable accident (25) on the roads. Motorways have no (26) bends, no roundabouts or traffic lights and (27) speeds are much greater than on other roads. Though the 70 mph limit is (28) in force, it is of ten treated with the contempt that most drivers have for the 30 mph limit applying in built up areas in Britain. Added to this is the fact that motorway drivers seem to like traveling in groups with perhaps (29) ten meters between each vehicle. The resulting horrific pile-ups (30) one vehicle stops for some reason--mechanical failure, driver error and so on—have become all (31) familiar through pictures in newspapers or on television. How (32) of these drivers realize that it takes a car about one hundred meters to brake to a stop (33) 70 mph.9 Drivers also seem to think that motorway driving gives them complete protection from the changing weather. (34) wet the road, whatever the visibility in mist or fog, they (35) at ridiculous speeds oblivious of police warnings or speed restrictions (36) their journey comes to a conclusion. Perhaps one remedy (37) this motorway madness would be better driver educa tion. At present, learner drivers are barred (38) motorways and are thus as far as this kind of driving is (39) , thrown in at the deep end. However, much more efficient poli cing is required, (40) it is the duty of the police not only to enforce the law but also to protect the general public from its own foolishness.
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Motorways are, no doubt the safest roads in Britain. Mile (21) mile, vehicle for ve hicle, you arc much (22) likely to be killed or seriously injured than on an ordinary road. On (23) hand, if you do have a serious accident on a motorway, fatalities are much more likely to (24) than in a comparable accident (25) on the roads. Motorways have no (26) bends, no roundabouts or traffic lights and (27) speeds are much greater than on other roads. Though the 70 mph limit is (28) in force, it is of ten treated with the contempt that most drivers have for the 30 mph limit applying in built up areas in Britain. Added to this is the fact that motorway drivers seem to like traveling in groups with perhaps (29) ten meters between each vehicle. The resulting horrific pile-ups (30) one vehicle stops for some reason--mechanical failure, driver error and so on—have become all (31) familiar through pictures in newspapers or on television. How (32) of these drivers realize that it takes a car about one hundred meters to brake to a stop (33) 70 mph.9 Drivers also seem to think that motorway driving gives them complete protection from the changing weather. (34) wet the road, whatever the visibility in mist or fog, they (35) at ridiculous speeds oblivious of police warnings or speed restrictions (36) their journey comes to a conclusion. Perhaps one remedy (37) this motorway madness would be better driver educa tion. At present, learner drivers are barred (38) motorways and are thus as far as this kind of driving is (39) , thrown in at the deep end. However, much more efficient poli cing is required, (40) it is the duty of the police not only to enforce the law but also to protect the general public from its own foolishness.
Motorways are, no doubt the safest roads in Britain. Mile (21) mile, vehicle for ve hicle, you arc much (22) likely to be killed or seriously injured than on an ordinary road. On (23) hand, if you do have a serious accident on a motorway, fatalities are much more likely to (24) than in a comparable accident (25) on the roads. Motorways have no (26) bends, no roundabouts or traffic lights and (27) speeds are much greater than on other roads. Though the 70 mph limit is (28) in force, it is of ten treated with the contempt that most drivers have for the 30 mph limit applying in built up areas in Britain. Added to this is the fact that motorway drivers seem to like traveling in groups with perhaps (29) ten meters between each vehicle. The resulting horrific pile-ups (30) one vehicle stops for some reason--mechanical failure, driver error and so on—have become all (31) familiar through pictures in newspapers or on television. How (32) of these drivers realize that it takes a car about one hundred meters to brake to a stop (33) 70 mph.9 Drivers also seem to think that motorway driving gives them complete protection from the changing weather. (34) wet the road, whatever the visibility in mist or fog, they (35) at ridiculous speeds oblivious of police warnings or speed restrictions (36) their journey comes to a conclusion. Perhaps one remedy (37) this motorway madness would be better driver educa tion. At present, learner drivers are barred (38) motorways and are thus as far as this kind of driving is (39) , thrown in at the deep end. However, much more efficient poli cing is required, (40) it is the duty of the police not only to enforce the law but also to protect the general public from its own foolishness.
3 The blue, mystic Lake Ellsinore lies in an inland California valley, which is teeming and steaming with hot springs. Rimmed by shaggy mountains whose forested crests are re flected in its clear waters, Lake Ellsinore is the very personification of peace—but on it rests the curse of Tondo. The lake had a colorful history. Much of it lies buried in legend, and it is difficult to separate fact from fiction. There have been stories of underground volcanoes on the lake bottom, erupting, killing fish and discoloring the water. There have been stories of a play ful sea serpent that lived in its depths. Long noted for its scenic beauty and health-giving waters, the lake was a famous re sort in the Nineties. But long before the first white man had set foot along the shore of the lake, this part of California had been the home of the Soboba Indians. Their chief was Ton do, a stern and unforgiving man. He had a daughter, Morning Star, who was in love with Palo, son of the chief the Pales, a neighboring tribe. The Sobobas and Pales were sworn enemies. For a time the lov ers met secretly. Then one day they were discovered by Tondo. His rage was terrible to be hold. He forbade the lovers ever to meet again. Morning Star tried in every way to appease her father’s anger, to soften his heart to ward Palo. But in time she saw that it was useless; that he would never give his consent to their marriage. Vowing that they would never be separated, the Indian maid and her lover walked hand in hand into the lake, as the dreary November sun cast long shadows on the land. They were followed by a group of orphan children whom Morning Star had befrien ded. All walked into the lake, singing the mournful death song of their people, while Ton do stood on the shore and cursed the lovers, cursed the blue water into which they all walked to their death. Ever since that day it would see that a jinx has been laid over Lake Ellsinore. Old-tim ers tell of a great upheaval in the lake which caused water to spout into the air like a geyser and turn blood-red. Later, it became known that three hundred springs of boiiing mud and water were born in the valley during that upheaval. The springs reeked with sulphur. For many years after this phenomenon the lake remained peaceful. Then boats were overturned for an apparent reason, and few of their occupants ever returned to tell the story. This continued for several years. At the same time, strong swimmers dived into the lake never to reappear. In 1833 and again in 1846, fish in the lake suddenly died. In the spring of 1850 came the Battle of the Gnats. They bred in the water of the lake and swarmed over the land. They invaded the countryside until the harassed inhabitants called for help. And in July 1951, the sky-blue waters of the lake vanished like mist before a noonday sun. When the bottom was laid bare there was no trace of a volcano, the bottomless pits, or the other disturbances of legend or fact. The copious winter rains of 1951—1952 have replenished the lake. But what menace does its haunting beauty hold today For tomorrow The once mighty Sobobas are few now. But the old men swear that their ancestors still haunt the lake. They nod grizzled head and murmur that the Great Tondo’s curse will for ever remain upon the lake. Only Time, the wise and silent one, can tell. The word "jinx" (Line 1, Par
×年×月×日14时7分，某市煤气公司液化气站的102号400m3液化石油气球罐发生破裂，大量液化石油气喷出，顺风向北扩散，遇明火发生燃烧，引起球罐爆炸。由于该球罐爆炸燃烧，大火烧了19个小时，致使5个400m3的球罐，4个450m3卧罐和8000多只液化石油气瓶(其中空瓶3000多只)爆炸或烧毁，罐区相邻的厂房、建筑物、机动车及设备等被烧毁或受到不同程度的损坏，直接经济损失约627万元，死36人，重伤50人。该球罐自投入使用后的两年零两个月使用期间，球罐经常处于较低容量，只有3次达到额定容量，第三次封装后4天，即在18日破裂。该球罐投用后，一直没有进行过检查，破裂前，安全阀正常，排污阀正常关闭。球罐的主体材质为I5MnVR，内径9200mm，壁厚25mm，容积400m3，用于贮存液化石油气。 1．根据断口特征和断裂力学的估算，该球罐的破裂是属于低应力的脆性断裂，主断裂源在上环焊缝的内壁焊趾上，长约65mm。 2．经宏观及无损检验，上、下环焊缝焊接质量很差，焊缝表面及内部存在很多咬边、错边、裂纹、熔合不良、夹渣及气孔等缺陷。 3．事故发生前在上下环焊缝内壁焊趾的一些部位已存在纵向裂纹，这些裂纹与焊接缺陷(如咬边)有关。 4．球罐投入使用后，从未进行检验，制造、安装中的先天性缺陷未及时发现和消除，使裂纹扩展，当球罐内压力稍有波动时便造成低应力脆性断裂。 根据以上内容回答下列问题： 液化气站存在哪些危险有害因素
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