One of the men held the view ____ the book said was right.

A．what that

B．what

C．that

D．that what

电热水器的漏电线圈是通过（）来检测是否漏电的。

A.火线电流

B.火线电压

C.零线电压

D.零线电流

E.火线与零线的电流是否和为零