比转数小于()的离心泵,往往在某一中间流量是达到最高扬程,而在流量降低时扬程稍降低。 发布时间:2017-08-12 02:06 │ 来源:www.tikuol.com 题型:单项选择题 问题: 比转数小于()的离心泵,往往在某一中间流量是达到最高扬程,而在流量降低时扬程稍降低。A.300 B.200 C.150 D.100
题型:单项选择题 _____ by the clear waters, this forest provides visitors with a wonderful chance to see some endangered native birds in the wild.A.Being surroundedB.SurroundingC.SurroundedD.To be surrounded 查看答案