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问题
单项选择题
嵌体的洞缘斜面应预备的角度为
A．10°
B．25°
C．37.5°
D．45°
E．55°
答案
参考答案：D
问答题 简答题
手摇道岔“六步曲”的内容？
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选择题
Bill's aim is to inform the viewers that cigarette advertising on TV is illegal, _____?
A. isn't it
B. is it
C. isn't he
D. is he
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