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问题 问答题 简答题

怎样选用锉刀？

答案

参考答案：

1.在锉削铸件、锻件或蓝皮件时用较粗的旧锉先开皮；

2.加工量大、加工面较大、工件较软的用粗锉；

3.加工量小，最后精锉时选用细纹锉或油光锉。

完形填空

The designer of Apple Computer, Steven Jobs, was not very successful  in his early year. He was not one of       at school, and sometimes he got into trouble with his teachers.        he was full of new ideas. Things were still      when he went up to college and he dropped out halfway (中途退学).

Steven Jobs worked      as a video game designer at Atari. He worked there for only a few months and then he       India. He hoped that the trip would give him more ideas and give him     in life for the better.

After he came back from      he began to live on a farm in California. And then, in 1975, Steven Jobs started     a new type of computer. Along with his friend Stephen Woziak , he designed the Apple I computer in his bedroom. He chose the name     “     ” because it reminded(想起 ) him of a happy summer he once spent in an orchard (果园 ) in Oregon.

Today Steven Jobs has lots of factories and he is very      in the world.
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单项选择题

有关下腔静脉的叙述，正确的是（）。

A.由左右髂外静脉汇合而成

B.是人体最大的静脉

C.沿腹主动脉左侧上升

D.有半奇静脉直接注入
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