当人体触及漏电设备的外壳,加于人手与脚之间的电位差称为()。
A.短路电压
B.接触电压
C.跨步电压
D.故障电压
参考答案:B
Mr. Green living in China though he was born in London. [ ]
A. would like
B. wants
C. hates
D. enjoys
采用中断称重法测定棉纤维的线密度,测得的数值().
A.偏低
B.偏高
C.标准
D.不能用这种方法