对于电缆的高阻故障，一般采用（）定点。
A.脉冲反射法；
B.直流电桥法；
C.声测法。
D.电压比法。
参考答案：C
—What's the matter with Rod?
—I think he's still that he didn't pass the driving test.
A．excited
B．loose
C．upset
D．glad
简述矿井地质预报及其形式。
