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

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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

墙体按其施工方法不同可分为[填空(1)] 、[填空(2)] 和[填空(3)] 等三种。

答案：块材墙；板筑墙；板材墙