三万压缩机工作轮采用形式是()。A.闭式 B.半开式 C.双面进气 发布时间:2019-10-30 11:58 │ 来源:www.tikuol.com 题型:单项选择题 问题: 三万压缩机工作轮采用形式是()。A.闭式B.半开式C.双面进气
题型:单项选择题 The manager was concerned to hear that two of his trusted workers ______. A.will leaveB.are leavingC.have leftD.were leaving 查看答案