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【判断题】
液压系统设计中,一般采用普通交流电机驱动液压泵。由于普通交流电机常用的有一、二、三对电极等几档,其同步转速分别为3000转/分钟、1500转/分钟、1000转/分钟,因此为液压泵选择配套的驱动电机时,首先要看电机同步转速是不是在液压泵的推荐工作转速范围内。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】Fortunately, the accident didn't many people, for there was little traffic at that hour.
A.
stuff
B.
hurt
C.
involve
D.
polish
【简答题】津液的功能:
【单选题】---You seem to have had that car for years. ---Yes, I should sell it ________ it still runs.
A.
before
B.
during
C.
until
D.
while
【单选题】Scientists are not sure how serious the effects of global warming will be.
A.
Right
B.
Wrong
C.
Not mentioned
【简答题】Fortunately, the accident didn't many people, for there was little traffic at that hour.
【简答题】Do American children still learn handwriting in school? In the age of the keyboard, some people seem to think handwriting lessons are on the way out. 90% of teachers say they are required to teach han...
【单选题】Even though “faraway” countries now seem closer, thanks to air travel, they _____ still be different from your home country.
A.
must
B.
may
C.
should
D.
shall
【单选题】Fortunately, the accident didn't many people, for there was little traffic at that hour.
A.
involve
B.
hurt
C.
stuff
D.
polish
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