问题
单项选择题
对混凝土的运输要求是使混凝土在( )浇筑完毕。
A．初凝前
B．初凝后终凝前
C．终凝后
D．终凝前
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
对混凝土的运输要求是使混凝土在( )浇筑完毕。
A．初凝前
B．初凝后终凝前
C．终凝后
D．终凝前
参考答案：A
 Mr. King works in a shop and drives a car for the manager. He drives carefully and can keep calm when 16 danger. And he escaped from several accidents. The manager 17 him more and the traffic policemen often speaks highly of him. Mr. Baker，one of his friends，works in a factory outside the city. It’s far from his house and he has to go to work by bus. As the street is 18 in the morning, sometimes he’s late for the work. His manager warns the young man that he will be sent away 19 he gets to his office on time. He hopes to buy a car，but he hasn’t enough 20 . He decides to buy an old one. One day, he went to the second-hand market and at last he chose a beautiful but cheap car. He said he wanted to try the car，the seller agreed. He 21 Mr King and asked him to help him at once. Mr. King examined(检查) the car and then drove it away. It was early in the morning and there were few cars in the street. At first he drove slowly and it 22 well. Then he drove fast. And when he reached a crossing，the lights turned 23 . He tried to stop it， but he failed and 24 hit an old woman who was crossing the street. A policeman told him to stop，but the car went on until it hit a big tree by the road. “Didn’t you hear me？” the policeman asked angrily. “Yes, I did，sir,” said Mr King，“ 25 it doesn’t listen to me，can it obey（听从）you？”
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