飞机以恒定的速度俯冲飞行,已知方向与水平面夹角为30°,水平分速度的大小为200km/h,求:
(1)飞机的飞行速度;
(2)飞机在1min内下降的高度。
(1)
(2)
My husband could not be here tonight, but I want to thank you ________ him. [ ]
A. on behalf of
B. stand for
C. because of
D. for the benefit of
下列属于进排气系统故障的是()。
A、空气不清洁
B、排气管阻塞或阻力过大
C、残留废气过多
D、空气流量减少