漏电保护器的负载端应该采用重复接地。
参考答案：错
The difficulty we now meet with is ___________ we can persuade him to tell the truth.
A．whether
B．that
C．what
D．why
食物经咀嚼吞咽后进入胃所引起的胃液分泌属于（）
A．头期胃液分泌
B．胃期胃液分泌
C．两者都是
D．两者都不是
