题目内容

酸奶若析出乳清，说明已经变质了，不能食用。

A. 对
B. 错

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2、加工中心与一般数控机床的区别是（）

A. 是否有刀库和自动换刀装置
B. 是否有自动排屑装置
C. 是否有自动冷却装置
D. 是否有三轴联动功能

在铣削加工余量不大且加工精度要求不高的平面时,可按( )进行加工

A. 一次铣去全部余量
B. 先粗后精
C. 阶梯铣削
D. 机械结构