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更多“fasten（）”相关的问题
第8题
大修后系统开车，规定锅炉压力从0至0.5MPa的升压时间为为6h，而从0.5MPa至3.5MPa的升压时间也需6h，其主要原因是（)。
A.提供锅炉热紧所需要的时间
B.为了控制转化器触媒预饱和时的温度上升速度
C.从0.5MPa升至3.5MPa期间，锅炉需要加强排污
D.在同样升压速度下，低压时锅炉温度上升快，产生的热应力大
第9题
Henry was worried. This was his first time to go traveling by air. He did not know how to
find his seat, so he went to the airhostess (空姐) and asked？ Could you help me？ I can't find my seat. "The air hostess showed him the seat and told him to sit down and fasten the seat (系好安全带). She told Henry- not to move about when the plane was going up. And she also said that Henry's ears might feel a little strange, but he didn't need to worry about it because many people felt like that. When the plane was flying very high, Henry could stand up and walk round. He could either read b6oks, newspapers or see films. The airhostess would bring food and drinks. Henry could enjoy the flight and arrive home soon.
点击查看答案
Which of the following is right？
A．After getting into the plane Henry found his seat and sat down at once.
B．Henry sat down in }lis seat and fastened the seat belt without any help.
C．Thanks to the air hostess, Henry knew how to find his seat and fasten the seat belt.
D．With the help of the hostess, Henry got into the plane.
