单项选择题

Start-Up Diagnostics are a diagnostic routine that regularly operate automatically when the CNC is switched on.

A．对
B．错

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单项选择题

A. B. C. D.

多项选择题

The following statements that do not produce a result set are ().

A．set @a=5;
B．select @a:=5;
C．select 5 into @a;
D．set @a:=5;