If you have a good attitude and a ____, you are sure to get a good job.
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Jackson is very hard-working and he has attended ____classes after work every day.
In order to get ____in the examination, Tom often stays up late these days.
液压马达和液压泵在工作原理上是可逆的，所以在实际结构上()
A. 所有的泵都能作马达使用
B. 只有少数泵能作马达使用
C. 所有的泵不能作马达使用
D. 所有的马达都可作泵使用
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