问题
单项选择题
烟花爆竹的点火引火线的引燃时间应保证燃放人员安全离开，且在规定时间内引燃主体。C级产品点火引火线的引燃时间为（）。
A、1s～3s
B、2s～5s
C、3s～8s
D、6s～12s
答案
参考答案：C
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烟花爆竹的点火引火线的引燃时间应保证燃放人员安全离开，且在规定时间内引燃主体。C级产品点火引火线的引燃时间为（）。
A、1s～3s
B、2s～5s
C、3s～8s
D、6s～12s
参考答案：C
| 用方框中所给单词的适当形式填空，使短文正确、通顺，每词限用一次。 | |
street corner. They ran there and 2______ that a small car knocked into the side of a trunk. 3______ the car driver and the truck driver were 4______. "Bob," said Jane."Run back down the road to Mrs. Day's house. Ask her 5______ the police and the ambulance (救护车). Hurry! I'll stay here." Bob went off as 6______ as possible. There was 7______ Jane could do but wait. She knew that when people were hurt in an accident, we shouldn't move them. It wasn't long 8______ the police car and the ambulance arrived. The policemen got the car door open and moved the man out. Then they got the truck driver out. 9______ ,the man weren't badly hurt, and the ambulance took then to the 10______. The policemen thanked Bob and Jane," You were very good to act so quickly when you saw the accident. Thank you for all your help." |