Kate was not sure_______.

A．that she should go through the third gate

B．if she should go through the third gate or not

C．which gate should she go through

D．which gate she should go through

起飞前或进近中，调场压的目的是（）。

A.使气压式高度表指示场压高

B.便于判断飞机离海平面的高度

C.使气压式高度表在飞机起飞前，在机场上指0，落地后也指0