题目内容

方向公差其公差带有、、三要素，浮动。

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位置公差带具有综合控制被测要素位置、方向和形状的功能

A. 对
B. 错

In 1932, physicists engaged in studying the atom and its nucleus had only three particles to consider: the proton, the neutron ,and the electron.

Each member(成员) has a switch with which to indicate a YES or NO vote(投票).

A text-book writer does not have available the material on which to base a reasonable conclusion as to who the credit(感谢) belongs.