目前我国民航常用的空管雷达是（）。

When pilot sets a pressure of （ ）mb for altimeter setting, that may be used to indicate a cruise flight level.

When pilot sets a QNH altimeter setting that will indicate （ ） .

VFR means （ ） Flight Rule.

VFR on top means VFR on the top of the （ ） .

The standard altimeter setting is （ ） in mm mercury.

The standard altimeter setting is （ ） in hpa.

2500 f/m rate of vertical speed is equal to （ ） .

119.15 m/s rate of vertical speed is equal to （ ） f/m.

For aircraft equipped with a transponder, crew members should squawk（ ）if they lost radio contact with ground.

Commence means （ ） .