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安全离合器的作用是什么？

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简述限流法分层压裂工艺原理。

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下面属于智能网应用的有（）

A. PPS
B. VPN
C. FREE CALL
D. CALL WAITING

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Which statement about the ip classless router command is true?（）

A. The ip classless command is enabled by default in recent versions of IO
B. The ip classless command should only be enabled when static routing is being used instead of a routing protocol.
C. The ip classless command should be enabled by the network administrator whenever RIPv1 or IGRP is being used.
D. The ip classless command should be enabled by the network administrator whenever OSPF, RIPv2, or EIGRP is being used.

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电缆线路与电力系统接通前必须进行核相（）。

A. 正确
B. 错误

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