题目内容

设备维护要达到哪些要求?

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PLC主要由()、()、()、()组成。

During the IPv6 address resolution,a node sends a neighbor solicitation message in order to discover which of these?()

A. The Layer 2 multicast address of the destination node
B. The solicited node multicast address of the destination node
C. The Layer 2 address of the destination node based on the destination IPv6 address
D. The IPv6 address of the destination node based on the destination Layer 2 addre

电焊钢管的公称直径一般为(),管壁较薄,承压很低。

A. 8~10mm
B. 10~140mm
C. 20~250mm
D. 30~50mm

简述电气系统操作原则。

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