皮皮学，免费搜题
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【多选题】
离心泵叶轮:( )
A.
将原动机的机械能传递给液体,使液体的压力能及动能均有所提高
B.
封闭式叶轮由前盖板、叶片、后盖板和所组成
C.
封闭式叶轮效率较高,但要求输送的介质较清洁
D.
叶轮还有与之分
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【简答题】根据句子意思和所给提示，完成下列句子。 1. Can you answer my question (正确地). 2. Dragon is the _________ (象征) of China. 3. The _________ (表演者) all danced very well. 4. The girl looks good in a________( 闪闪发光的) red silk dre...
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