气压式速度表通过测量气流的总压和静压来确定飞机的地速
参考答案：错
What makes you _____ it's going to rain tomorrow? [ ]
A. to think
B. thought
C. think
D. thinking
防雷保护装置安装要求每栋建筑物地面以上至少留有( )个接地电阻测定用的测点，并标识明显清晰。
A．1B．2C．3D．4
