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矿山安全技术 以下有关突出的说法正确的是( )。
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危险化学品安全技术 在易燃易爆区显眼的地方要没有“( )”的标志，以预防发生火灾爆炸事故。
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How did they get thereFour men were sitting in a bar in London, having a drink. They were talking about dogs."If you want to buy a nice dog," said the first man. "One of my greyhounds is racing in Manchester this evening. Why don’t you come and watch the race If you like the dog, you can buy it. ""I’ 11 buy it if it wins the race," said the second man."And I’ 11 buy it if it loses the race," said the third man."My family won’ t let me get a dog, but I’ d like to come and see the race," said the fourth man.They all went to Manchester to see the race, but they went there in different ways, the first man by car, the second man by plane, the third man by train and the fourth by bus.To cut a long story short, the dog won the race; the second man bought the dog from the first man, and they went to a restaurant to celebrate.While eating, they discussed the different ways of getting to Manchester, and wrote the information on the tablecloth, like this:Length of JourneyCost of journeyFirst man (by car)3hrs 30mins￡ 8.00Second man (by plane)45mins￡ 22.00Third man (by train)2hrs 30rains￡ 14.80Fourth man (by bus)4hrs 30nfins￡ 6.00Charlie said, "Well, that’s interesting. My journey was quicker than Albert’s or Dave’ s. ""That’ s right," said Albert, "but mine cost less than yours, Charlie, and less than Dave’ s. ""I don’t care how long a journey, takes," said Dave, "you’ll never see me in a plane. I’m terrified of flying."Bill didn’t say anything; he was wondering what his wife would say when he came home with a dog.The first man who went by car is (46) .The second man who went by plane is (47) .The third man who went by train is (48) .The fourth man who went (49) is (50) . 49（）
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