采用（）来测量高压断路器导电回路的直流电阻。
A.直流单臂电桥
B.直流双臂电桥
C.欧姆表
D.兆欧表
参考答案：B
You don’t know _____ I want to see you again. It’s a year since I last saw you.
A．how soon
B．how long
C．how often
D．how much
焦化柴油的十六烷值低，但溴价较高。
