问题
单项选择题
对于进行定常飞行的飞机来说()
A.升力一定等于重力
B.作用在飞机上的外载荷必定是平衡力系
C.发动机推力一定等于阻力
答案
参考答案:B
对于进行定常飞行的飞机来说()
A.升力一定等于重力
B.作用在飞机上的外载荷必定是平衡力系
C.发动机推力一定等于阻力
参考答案:B
阅读下面短文,根据方框中所给的词语和短文内容, 在空白处填入适当词语,要注意必要的词形变化,使短文内容完整。(5分)
Today is Friday. Mr. Green 小题3:_____________ home very late because he is busy at the office. He is angry when he finds there isn’t anything to eat. He 小题4:_____________ to his wife, “I’m going to eat in a restaurant.” “Wait for ten minutes.” says Mrs. Green. “Why? Do you 小题5:_____________ supper can be ready in ten minutes?” asks Mr. Green. “No, of course not,’ she says. “I’m ready to go with you in ten minutes.” |