将叶轮与电动机的转子直联成一体,浸没在被输送液体中工作,又称为无填料泵的泵是( ) 发布时间:2018-01-15 23:48 │ 来源:www.tikuol.com 题型:单项选择题 问题: 将叶轮与电动机的转子直联成一体,浸没在被输送液体中工作,又称为无填料泵的泵是( )。A.旋涡泵B.离心泵C.屏蔽泵D.潜水泵
题型:单项选择题 They intended to have the school better equipped, the local government was not able to get enough money to do so.A.unlessB.whileC.althoughD.once 查看答案