Can you go to the concert with us this evening?()
A. No, I already have plans.
B. I'd love to, but I'm busy tonight.
C. No, I really don't like being with you.
D. I'm ill, so I shouldn't go out.
当起落架未放下锁好时,下列哪种情况一定会使起落架警告喇叭响()
A. 收油门
B. 襟翼放下
C. 襟翼收上
D. 襟翼放下超过15度
离心式机器转速在1500~3000转/分时,要求轴承处双向振幅不大于()。
A. 0.04mm
B. 0.05mm
C. 0.06mm
JZ-7型空气制动机自阀手柄在紧急制动位时,均衡风缸的压力空气将减压()。
A. 240~260kPa
B. 170kPa
C. 50kPa
D. 600kPa