少油断路器进行例行直流泄漏电流测试时,其试验电压应为()kV。
A.40
B.50
C.60
D.70
参考答案:A
Even though I’d hurt my leg, I______ swim back to the river bank.
A.could
B.might
C.had to
D.was able to
对检查者可靠度检验要计算
A.K值
B.q值
C.卡方值
D.U值
E.t值