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什么是空白试验？其目的是什么？

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The merchant undertakes that no claim or allegation shall be made against any servant，agent or subcontractor of the carrier which（）to impose upon any of them or any liability whatsoever in connection with the goods.

A. supplies or attempts to supply
B. imposes or attempts
C. complies or attempts to comply
D. provides or attempts to provide

请简述多目标决策的特点。

USB2.0两个外设之间距离（线缆长度）可达（）米。

A. 5
B. 4
C. 3
D. 2

合金结构钢按用途又可分为（）用钢和（）用钢两类。