题目内容

That was when he began to __________ ( 离开，撤退) from the real world and live in a virtual one.

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For shy,__________ (内向的) people, meeting people online is a way of hiding their true selves.

But what happens when they can no longer __________ (接近) their virtual world?

范成仪模拟齿轮加工，当刀具中线与轮坯分度圆相切，并做纯滚动时，可切制齿轮。

A. 标准齿轮
B. 正变位齿轮
C. 负变位齿轮
D. 无法判断

范成仪模拟齿轮加工，当刀具中线靠近轮坯分度圆，并做纯滚动时，可切制齿轮。

A. 标准齿轮
B. 正变位齿轮
C. 负变位齿轮
D. 无法判断