问题
单项选择题
下列哪项不是做嵌体修复时，牙体预备的要求
A．底平壁直、线角清晰
B．洞缘斜面2°～5°，宽约0.5mm
C．洞形无倒凹
D．必要时可加鸠尾固位
E．邻面做片切形
答案
参考答案：B
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下列哪项不是做嵌体修复时，牙体预备的要求
A．底平壁直、线角清晰
B．洞缘斜面2°～5°，宽约0.5mm
C．洞形无倒凹
D．必要时可加鸠尾固位
E．邻面做片切形
参考答案：B
| 完形填空。 | ||
| Sam 1 Jim are 2 near Mr Green's house. They- are throwing a Frisbee (飞盘). Sam can't throw 3 Frisbee. Jim says to him, " 4 throw it like this." "Like this?" "Yes, good!" "Look out (当 心)!" "Oh 5 !" Mr Green's 6 is broken. 7 is drinking 8 under a tree. "I'm 9 , Mr Green " Sam says. Mr Green says, "It doesn't matter. Please 10 play near my house next time (下次)." | ||
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