题目内容

线路两股钢轨接头,一般应采用错牙式。

A. 正确
B. 错误

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质量手册必须确定质量管理体系覆盖的产品范围。

A. 正确
B. 错误

何为同步通信?何为异步通信?各自的特点是什么?

Which two statements describe the behavior of the server's SQL mode?()

A. The server's SQL mode determines how the server should behave when performing data validation check and interpreting different forms of syntax
B. The server's SQL mode determines whether the server should be read-only or should accept commands such as INSERT and UPDATE
C. The server's SQL mode can be changed at the session level with a SET SESSION sql_mode="new_value" command
D. The server's SQL mode, when globally set on a slave server, applies to events sent from the master

金属氧化物避雷器(又称氧化锌避雷器)一般可分为()两类。

A. 无间隙
B. 有续流
C. 有串联间隙
D. 有并联间隙

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