轴流风机比离心式风机效率()。A、低;B、一样;C、高;D、不确定。 发布时间:2017-08-12 21:22 │ 来源:www.tikuol.com 题型:单项选择题 问题: 轴流风机比离心式风机效率()。A、低;B、一样;C、高;D、不确定。
题型:单项选择题 I’m not a little tired today after giving the room a thorough cleaning and I have never had ____ today.A.as tiring a day asB.as a tiring dayC.tiring as a day asD.day as a tiring as 查看答案