单项选择题

 泵壳具有汇集液体和将部分动能转为静压能的作用
A、正确
B、错误

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中国茶文学的开山之作是什么 A、《僮约》 B、《荈赋》 C、《七碗茶歌》 D、《茶经》
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A purchase plan for a stereo receiver requires 20 percent of the total cost as a down payment and monthly payments of $30.Column A Column BThe total cost of the stereo receiver $450A.if the quantity in Column A is greaterB.if the quantity in Column B is greaterC.if the two quantity are equalD.if the relationship cannot be determined from the information given
A.Column
B.if
C.if
D.if
E.if
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