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问题 填空题

YJ19卷烟机打印轮安装时，应先将打印轮放入（）中，穿上轴，再将螺钉锁紧。

答案

参考答案：打印支架

单项选择题

畸形舌侧沟引起牙周炎症者，正确的处理是()

A．牙髓治疗

B．根尖切除术

C．根尖诱导成形术

D．拔除

E．盖髓术
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选择题
Victor apologized for ____ to inform me of the change in the plan.

A. his being not able
B. him not to be able
C. his not being able
D. him to be not able
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