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【单选题】
由图中键槽形状可判断，轴和轴上传动件用（）连接。【图片】A.
普通型平键 C 型
B.
钩头楔键
C.
普通型平键 A 型
D.
半圆键
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举一反三
【单选题】_____ should not become a serious disadvantage in life and work. A. To be nottall B. Not being tall C. Being nottall D. Not to be tall
A.
To be nottall
B.
Not being tall
C.
Being nottall
D.
Not to be tall
【单选题】设有一熟练工人，用4种不同的机器在6种不同的运转速度下生产同一种零件。在单位时段内生产的零件数见表:速度1速度2速度3速度4速度5速度6机器142.539.339.639.942.943.6机器239.540.140.542.342.543.1机器340.240.541.343.444.945.1机器441.342.243.544.245.942.3判断运转速度的检验统计量为（）。
A.
2.901
B.
5.317
C.
3.287
D.
3.391
【简答题】设有一熟练工人，用4种不同的机器在6种不同的运转速度下生产同一种零件，同在单位时段内，生产的零件数如表1.4所示．试分析机器、运转速度对产量有无显著影响(α=0.05)． 表1.4 说明：小数点后的数是根据最后一个零件完成的程度定出的．
【单选题】Rain forests _____and burmed at such a speed that they will disappear from the earth in the near future. A. cut B. are cut C. are being cut D. had been cut
A.
1
B.
2
C.
3
D.
4
【简答题】无水柠檬酸大量用于 。柠檬酸的 是某些食品中需要添加金属离子的强化剂。
【简答题】语态练习 1. The structure of aircraft _________ all the time. A. is being changed B. has been changed C. is being changing D. had changed 2. In 1950, she was the largest ship that ________. A. was ever bu...
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