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【单选题】
双作用叶片泵叶片间夹角θ、封油区圆心角ε、定子圆弧段圆心角β之间，如果ε>β>θ，()。A.
容积效率降低
B.
发生困油现象
C.
径向为增大
D.
A+B
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举一反三
【单选题】75%的消毒酒精,是指
A.
100mL 水中含 75ml 酒精
B.
100g 水中含 75ml 酒精
C.
25ml 水中加入 75ml 酒精
D.
100g 水中含 75g 酒精
【单选题】Crying is a nearly universal sign of grief, though some mourners report that, despite genuine sorrow, they cannot shed tears,sometimes even for years after their loved one has gone. Unlike today, when...
A.
- Sometimes people cannot cry despite genuine grief.
B.
- Men are less likely to give reasons for their tears.
C.
【单选题】When Mrs. Ritchfield walked him to school the day after the funeral, the author felt______.
A.
embarrassed by no elitist English car
B.
inferior to Danny and his friends
C.
relieved for being equals with Danny and his friends
D.
extremely sensitive about the loss of an expensive car
【简答题】金属固态相变有哪些主要特征?哪些因素构成相变的阻力?
【判断题】Zhao Zilong Lion is a symbol of inauspiciousness and usually burned right after the funeral.
A.
正确
B.
错误
【单选题】75% 的消毒酒精是指:( )
A.
100ml 水中含 75ml 酒精
B.
100 克水中含 75ml 酒精
C.
25ml 水中加入 75ml 酒精
D.
100 克水中含 75 克酒精
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