上盖板喷锌之前钢表面必须达到Sa3级清理标准。
参考答案：错
— do you speak English so well?
—Because I practice it with my partner every day.
A. Why B. When C. Who
颞下颌关节成形术两个骨断面之间的间隙应保持在
A．0.5cm以内
B．2.Ocm左右
C．3.Ocm左右
D．0.5～1.Ocm
E．2.0～3.Ocm
