题目内容

塑性材料破坏(失效)的标志是材料产生了( B );脆性材料破坏(失效)的标志是材料产生了( )

A. 断裂
B. 屈服
C. 屈服和断裂
D. 弹性变形

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对于铸铁圆轴扭转试件的破坏形式及原因是( )。

A. 断裂面垂直于试件轴线,断裂是由该截面拉应力过大引起的。
B. 断裂面垂直于试件轴线,断裂是由该截面剪应力过大引起的。
C. 断裂面与轴线成45º的,断裂是由该截面拉应力过大引起的。
D. 断裂面与轴线成45º的,断裂是由该截面剪力过大引起的。

对于铸铁拉伸试件的破坏形式及原因是( )。

A. 断裂面垂直于试件轴线,断裂是由该截面拉应力过大引起的。
B. 断裂面垂直于试件轴线,断裂是由该截面剪应力过大引起的。
C. 断裂面与轴线成45º的,断裂是由该截面拉应力过大引起的。
D. 断裂面与轴线成45º的,断裂是由该截面剪力过大引起的。

二、Part B：用方框内所给的A.B.C.D.E五个句子完成以下对话.Dialogue 1Waiter: Welcome to Meiwei Restaurant! This way please.Customer: Thank you.(A moment later.)Waiter: Good evening, Sir.(1) Customer: OK, I’d like the vegetable salad to start with.waiter: (2)Customer:Beef steak,please.Waiter:(3)Customer:Medium,please.Waiter:(4)Customer:Aglassoforangejuice,please.Waiter:(5)__Customer:No,thanks.A.Wouldyoulikesomethingtodrink?B.Andwhat'sforthemaincourse?C.OK,anythingelse?D.Areyoureadytoorder?E.How would you like it cooked, well done or medium?

2. Dialogue2（In a clothing shop.）Salesgirl：What can I do for you，sir？Man：（1）Salesgirl：What colour does he like？Man：Blue.（2）Can you show me a blue one？Salesgirl：Sure.（3）Man：Size M，please？Salesgirl：Here you are.Man：（4）Salesgirl：Fifty Yuan.Man：Well，it's a bit expensive.（5）__Salesgirl：How about forty Yuan？Man：OK.I'll take it.A：Can you give me a discount？B：What size do you want？C：I want to buy a T-shirt to for my son.D：How much is it？E：Blue is his favorite colour.