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问题 单项选择题

石膏是临床常用的模型材料，其质量与调和时的混水率对性能影响十分明显

硬质石膏的混水率为

A．0.22

B．0.5

C．0.35

D．0.24

E．0.8

答案

参考答案：C

解析：硬质石膏的混水率为0.25～0.35，孔隙减少，更加致密。硬质石膏主要用于可摘局部义齿、全口义齿和固定义齿工作模型的灌注。

选择题

The square was so named________a famous black leader in history. [ ]

A. in favor of  

B. in search of

C. in face of  

D. in honor of
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选择题

When I arrived,I found Tom was        roasted duck and green peas alone. [ ]

A.appealing to

B.feasting on

C.picking up

D.sending off

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