判断数控机床的可靠度主要根据( )。 A.
机床精度 B.
机床机械效率 C.
机床实际无故障工作概率 D.
机床生产率

A．UK
B．Europe
C．USA
D．Asia

A．Walk or roll on wheels
B．Do housework, such as cleaning, washing.
C．Both A and B.