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