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问题 单项选择题

履带式打挖掘机短距离转移地工地时，每行走（）应对行走机构进行检查和润滑。

A.200~700m

B.300~900m

C.500~1000m

D.700~1300m

答案

参考答案：C

单项选择题

(66) is a protocol that a host uses to inform a router when it joins or leaves an Internet multicast group.

(67) is an error detection code that most data conlmunication networks use.

(68) is an interior gateway protocol that uses a distance vector algorithm to propagaterouting information.

(69) is a transfer mode in which all types of information are organized into fixed form cells on all asynchronous or nonperiodic basis over a range of media.

(70) is an identifier of a web page.

（70）处填（）。

A．HTTP

B．URL

C．HTML

D．TAG
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单项选择题

对首次使用、使用间隔时间超过（）的配合比应进行开盘鉴定。

A、3个月

B、4个月

C、5个月

D、6个月
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