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【单选题】
四冲程发动机曲轴，当其转速为2000r／min时，则同一气缸的进气门，在1min内开闭次数是（）。A.
2000 次
B.
1000 次
C.
500 次
D.
4 000 次
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反馈参考答案：
举一反三
【单选题】In the third paragraph the writer indicates how human connection______．
A.
encourages students having difficulty
B.
provides evidence of good teaching
C.
affects the use of modern technology
D.
prevents students from quitting school
【简答题】Located in front of the
turbine, the locking clutch of the hydraulic torque converter consists of
locking piston, shock absorbers and turbine drive plate.
【简答题】翻译: The transmission system consists of clutch, gearbox, propeller shaft, rear axle ,differential and the driving road wheels.
【简答题】如何培养良好的心理状态？
【单选题】How teachers perform. in their classes______a strong influence on the growth of the students.
A.
has
B.
have
C.
having
D.
to have
【单选题】关于提高分析结果准确度的方法,下列表述中正确的是:
A.
)选择灵敏度高的仪器分析方法;(2)增加平行测定次数减小随机误差;
B.
)称样量越小越好;(4)做对照试验消除系统误差
C.
2,3
D.
2,4
E.
1,2
F.
1,3
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