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进给量对切削加工表面粗糙度的影响较大。()

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一般来说，小学生入学时，有意识记占主导地位。()

协调环(相依环)是根据装配精度指标确定组成环公差。()

装配尺寸链中的封闭环存在于零部件之间，而绝对不在零件上。()

The chronic fiscal deficit of the U.S. is due to

A. increasing federal programs.
B. expenses for the aged and the disabled.
C. increased health care costs.
D. insufficient federal taxation.