最大极限尺寸与最小极限尺寸之代数差的绝对值称为__________。
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公差的实质是协调机器零件的装配使用要求与加工制造难易程度之间的矛盾。( )
A. 对
B. 错
What's the image of the philosophy professor?
A. Eccentric
B. Fashionable
C. Thoughtful
D. Childish
About _ of the class know something about their grandparents.
About three-fourths of the class know something about their great-grandparents.
A. 对
B. 错