题目内容

拆卸时,螺纹零件的()必须辨别清楚。

A. 受力方向
B. 受力位置
C. 结构
D. 旋松方向

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复合压延

A UDT is a data type which:()

A. must contain unique values.
B. cannot be CAST to other data types.
C. is created using the CREATE DISTINCT command.
D. contains a value that was automatically calculated from values in other columns.

简述乳铁蛋白的活性作用。

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