为客户办理了换折手续后，应在旧折封面上加盖（）戳记。
A.作废
B.清户
C.注销
D.换折
参考答案：C
Which is not a goal in both project management and quality management
A) Prevention over inspection. B) Customer satisfaction. C) Management responsibility. D) Triple constraint.
复合树脂充填体为加宽釉质酸蚀刻带的宽度，洞缘釉质壁应制成（）。
A.30°角短斜面
B.45°角短斜面
C.60°角短斜面
D.135°角内倾斜面
E.120°角内倾斜面
