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问题 单项选择题

合理选择凸模、凹模的配合间隙及圆角半径，能使拉深过程中（），又可得到合格制件。

A、变形抗力大

B、变形抗力小

C、制件质量差

D、摩擦生热

答案

参考答案：B

补全对话，情景问答
有问必答。给下列的问句选择合适的答语。
( ) 1. Why is he quiet?
( ) 2. Why do you wash your hands?
( ) 3. Jenny, why do you draw a circle?
( ) 4. Why don't you go outside?
( ) 5. Li Ming, why do you wear your boots?

A. Because they are dirty.
B. Because I'm tired (累).
C. Because he's reading a book now.
D. Because my favourite shape is a circle.
E. Because it's raining outside.
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单项选择题

对于医疗器械相关性压疮风险患者，可使用（）敷料作为身体与医疗器械接触部位的保护

A.硅胶

B.含银

C.纱布

D.泡沫
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