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问题 单项选择题 A1/A2型题

增强铸造金属全冠固位力的方法有（）

A.在面制备针道，轴壁制备轴沟

B.在龈边缘制备台阶

C.降低牙尖高度

D.降低牙尖斜度

E.以上措施都正确

答案

参考答案：E

选择题

He studied hard and later became a well-known writer, ____ his father expected.

A．that was what

B．what was that

C．and which was

D．which was what
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选择题

乙烷、乙烯、乙炔分子的共价键中σ键和π键的数目正确的是       （  ）

A．6、1，4、2，2、3

B．7、0，5、1，3、2

C．7、0，4、2，2、3

D．7、0，5、1，2、3
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