对保护零线的线路有哪些规定？

---- Daddy, I failed English exam this time, I am not interested in it any more.

---- _____! You will be successful one day as long as you work hard at it.

A．Never give up

B．Cheers

C．What a surprise

D．Well done

If you ___require any further information, please do not hesitate to contact us.

A．should

B．would

C．could

D．might

制约和影响绩效考评的正确性、可靠性和有效性的因素主要有()。

A.后继效应

B.评价指标对考评的影响

C.自我中心效应

D.评价标准对考评的影响

E.员工绩效的分布误差

频闪多次曝光法是（)的特殊形式。

对于IPV4，根据IANA分配的SSM范围的地址空间，下面哪些地址是合法的？（）

A.232.137.1.1/24

B.225.137.1.1/8

C.232.137.1.1/8

D.239.137.1.1/8