是衡量黏性大小的指标,是液压油最重要的参数。液体的黏度具有随温度的升高而,随压力增大而 的特性。
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液压传动所用的工作介质是什么?液压工作介质的用途有哪些?
There are_______apples at home. Let’ s go and buy some.
A. a few
B. few
C. a little
D. little
—Which subject do you like_______?—Computer.
A. well
B. good
C. best
—Is Jim in the library?—No, he_______in the gym.
A. dances
B. dancing
C. is dancing