可摘局部义齿铸造支架折断的常见原因是() A．塑料基托与人工牙

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问题单项选择题

可摘局部义齿铸造支架折断的常见原因是()

A．塑料基托与人工牙胶接不良

B．弯制过程中在同一过程反复修改

C．前牙覆过深，咬合过紧

D．龈距离过低

E．铸件内部有缺陷

答案

参考答案：D

单项选择题

Speaker A: I can’t stand the school cafeteria. The food is terrible.
Speaker B: ().

A. I agree with you. It’s quite difficult to find a seat in the cafeteria.

B. Yeah, you will feel more comfortable if you sit down.

C. Yeah, but that’s not the worst thing about it. It’s also very dirty.

D. I don’t see why they don’t supply some seats for us.

判断题

上外网的计算机必须与上公安网的计算机严格从物理上分开，保证专机专用。