机械零件材料内部任一点因外力作用引起的形状和尺寸的相对改变称为()。
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混凝土试件相邻面夹角公差靠试模相邻面夹角控制。()
A. 正确
B. 错误
混凝土试件制作前,应在试模内表面涂一薄层矿物油或脱模剂。()
A. 正确
B. 错误
He hadn't _______ quite what was wrong with .his mother. He knew, though, that she hadn't
A. worked off
B. worked on
C. worked out
D. worked at