依据国标，限速器的垂直度为（）；主导轨导靴间隙（）
参考答案：0.5mm；1-2mm
电缆故障声测定点时，禁止直接_____电缆_____或冒烟小洞，以免触电。
24. He is the first person you can think of to rely on, for he is always willing to ___whoever is in trouble.
A．figure out
B．make out
C．help out
D．find out
