题目内容

Sparing no efforts to investigate the security practices of the site is often well worth.

A. 对
B. 错

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Compared with face-to-face conversations, online communication has some limitations.

A. 对
B. 错

Many users often use privacy controls, or even know about them.

A. 对
B. 错

下列车削加工顺序安排原则中,错误的是( )

A. 基面先行
B. 先近后远
C. 先外后内
D. 先内后外

数控机床的F功能常用( )单位

A. m/min
B. mm/min或mm/r
C. m/r
D. r/mm

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