多项选择题

头晕分哪几种？

A．眩晕
B．平衡失调
C．晕厥前状态
D．晕厥

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单项选择题

As far as possible, the ( ) principle should be adopted in order to ensure the position accuracy of each relative surface of workpiece and reduce the design and manufacture cost of fixture.

A．Self-datum
B．Mutual datum
C．Datum uniform
D．Datum superposition

不定项选择

物料清单（BOM）是用规范的数据格式来描述产品结构的文件。

A．正确
B．错误