瓦斯爆炸的条件是：一是瓦斯浓度5%~16%，二是混合气体中氧气的浓_爱下问搜题

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问题填空题

瓦斯爆炸的条件是：一是瓦斯浓度5%~16%，二是混合气体中氧气的浓度不低于（）三是引爆火源温度650℃~750℃。

答案

参考答案：12%

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I went to my favorite restaurant one evening to have supper. I knew the owner very well. 1 I was waiting for the soup to arrive, I looked around to see if I knew anyone in the restaurant. It was 2 that I noticed a man sitting at the corner table 3 watching in my direction, as if he knew me. The man had a newspaper open 4 him, which he was 5 to read, though all the while I could see that he was keeping an eye on me. When the waiter brought the soup, the man was clearly 6 by the familiar way in which the waiter and I talked to each other. He became even more puzzled as time went on and it grew more and more obvious that I was well 7 in the restaurant. In the end he got up and went to the kitchen. After a few minutes he came 8 again, paid his bill and left without 9 looking in my direction.
When I finished and was 10 to pay my bill, I called the owner over and 11 him what the man had wanted. The owner at 12 didn’t want to tell me. I 13 “ Well”, he said “ that man was a detective.” “ 14 ?” I said, much surprised. “ he followed you here because he 15 you were the man he was looking for,” the owner said. “ He showed me a photo of the 16 man. He certainly looked 17 you! Of course since we know you here. I was able to make him 18 that he had made a mistake.” “ It’s 19 I came to a restaurant where I’m where I’m known,” I said, “ otherwise I 20 have been taken to police station!”

C．in front of

单项选择题

I度烧伤的临床表现是指皮肤（）。

A.有水疱

B.红肿热痛

C.苍白

D.有分泌物