题目内容
某施工单位承包了高级公路K25+100～K30+50段的路面施工工程，路基宽为20 m，设计行车时速为100 km/h，公路全长30 km，路面结构为：路面底基层为级配啐石30 cm，20 cm石灰稳定碎石土基层，25 cm沥青混合料面层，施工单位在施工过程中严格按设计要求和操作规程开展施工，在沥青混凝土路面施工前制定了详细的施工安全要点，现摘录部分如下： ①摊铺机卸料时，熨平装置的端头与路缘石应有一定间距，以免发生碰撞； ②人工装卸桶装沥青时，运输车应停在有坡度地段，方便装卸； ③用柴油清洗摊铺机时．不许接近明火； ④采用切缝机切缝前应先打开冷却水，冷却水中断时．应停止切缝。施工单位在沥青混凝土的施工过程中，对其施工内容做了符合规范要求的检验， 根据以上材料 回答下列问题 能起排水、隔水、防冻、防污等作用了路面结构层为( )。
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It may be the last book you’ll ever buy. And certainly, from a (21) standpoint, it will be the only book you’ll ever need. No, it’s not the Bible or some New Age tome (22) enlightenment--although it would let you carry (23) both texts simultaneously. It’s an electronic book--a (24) volume that could contain a library of information or, if your tastes run (25) what’s current, every title on today’s bestseller (26) And when you’re (27) with those, you could refill it with new (28) Convenience is its main (29) and that means more than simple portability. Because the information is in electronic (30) , it can be easily manipulated. You could, for instance, make the type larger for easier reading. Or you could make notes in the (31) with a stylus your observations being (32) on tiny, removable flash-memory card in the spine. It is likely that electronic books will come pre-loaded with a (33) of titles. New titles could be made (34) through flash-memory cards, for example, internet will be the delivery method of choice. Imagine browsing an online bookstore like www. Amazon. com, corn and downloading a novel (35) your electronic book via the modem in its spine. (36) Moby Dick would take about a minute. You could download a few titles, so you’ll have a few good reads to choose from while you’re relaxing at the beach. If your first choice is not to your (37) , a new title becomes available (38) the push of a button. An electronic book will be (39) --around ＄ 200 for a basic read-only model to about ＄ 400 for one that would (40) your margin scribbles. Some hurdles remain, though, before you can take an electric book with you anywhere.
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For this part, you are allowed 35 minutes to write a composition on the topic "Studying Over- seas". You should write at least 150 words and you should base your composition on the outline (given in Chinese ) below: (1)有些人认为出国留学有一定的好处，但困难太多； (2)我则认为…… (You should write 160—200 words neatly on ANSWER SHEET 2．)
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