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问题 单项选择题

金属全冠制作完成后临床戴牙时颈缘崩瓷主要原因是（）

A.颈缘瓷层过厚

B.颈缘瓷层过薄

C.基底冠颈缘过长

D.基底冠颈缘过短用瓷恢复长度

E.基底冠颈缘过后

答案

参考答案：B

单项选择题

The CPU does not have to look (66) all of RAM to find the spot it needs. But RAM only (67) the data temporarily. As soon as you switch the computer (68) , all that information disappears from the RAM. When you switch the computer on again, the RAM is (69) , and ready (70) a new program and new data.

（68）处填（）。

A．off

B．on

C．up

D．down
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单项选择题

修剪成年脐橙树，不合理的修剪操作行为是（）。

A.剪阴不剪阳

B.剪密不剪稀

C.剪翘不剪吊

D.剪弱不剪强
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