简述凝固裂纹的形成机理及防止措施。凝固裂纹的形成机理?

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问题:

简述凝固裂纹的形成机理及防止措施。凝固裂纹的形成机理?

考点:金属材料金属材料塑性成形金属材料塑性成形题库
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短语填空。请阅读下面各小题,从方框中选择适当的短语填空,并在答题卷上将其序号涂黑。每个短语限用一次。(每小题1分)

A in order to   B all the time  C feel like    D so far   E rather than

F get on with  G by accident  H plenty of   I used to  J grow up

小题1:When my brother was young, he couldn't wait to__________

小题2:We have called the restaurant three times__________but the line is busy.

小题3:The old man ____live here, but last month he moved back to his hometown.

小题4:Many students' problem is that they can't__________their parents.

小题5:It's great that she has got a job and doesn't have to stay at home____.

小题6: If you're afraid of taking the lift or just__________exercising, you can climb the stairs to go up.

小题7:I really don't want to know your secret.I only found it____.

小题8:The Internet provides us with__________information which is used in many ways.

小题9: They are riding a bicycle around the island____experience as much of it as possible

小题10:The next day, Peter went to soccer practice with courage____fear in his heart.

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醇烯比是影响醚化反应的一个重要因素。

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某公司2003年发生两笔互换房产业务,并已办理了相关手续。第一笔业务换出的房产价值500 万元,换进的房产价值800万元;第二笔业务换出的房产价值700 万元,换进的房产价值300万元。已知当地政府规定的契税税率为3%。该公司应缴纳的契税额为( )万元。

A.9
B.12
C.21
D.24

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井下冒顶埋(堵)()人及以上是淮北矿业重大涉险责任事故界定标准规定的内容之一。

A、1

B、2

C、3

D、4

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下列各项中不属于消法范畴的是()

A.消导食积

B.通导大便

C.消痞化积

D.消痰利水

E.消疮散痈

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