问题
单项选择题
梁式渡槽槽身结构为U形槽身的适应跨度为( )。
A．10～15m
B．10～18m
C．10～20m
D．15～20m
答案
参考答案：D
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梁式渡槽槽身结构为U形槽身的适应跨度为( )。
A．10～15m
B．10～18m
C．10～20m
D．15～20m
参考答案：D
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| You walk on the street, a man suddenly falls down on the road in front of you. It's a heart 1 ! What should you do? Students in Guangzhou Xiaoyuan Middle School would tell you: do first aid! (急救) Last week, doctors went to the school to 2 the kids about first aid. Students first had a lesson 3 CPR (心肺复苏术). Then they 4 on a model. They had to hold the model's nose closed with one hand and hold its mouth open with the other hand. Then they had to 5 into the model. 6 they did it 7 the right way, the model's chest (胸部) got bigger. Zhang zijin, a Junior 1 student, found CPR was 8 to do than he thought. "I breathed 9 into the model then I 10 saw its chest bigger," said the 13-year-old boy. Another boy, Chen Geng, said first aid was 11 . Now he often practices CPR at home. "I'm afraid I'll 12 how to do it." Li Yanping, a doctor said it was 13 to learn first aid. She said if a person got CPR within (在…之内) four minutes 14 the heart stops beating, his life might be saved. "The more people learn CPR, the more lives 15 be saved in the future." said Li. | ||||
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