风机叶轮按结构特点分为开式、半开式和闭式,通常情况下为()结构形式。A、开式 B、闭 发布时间:2019-10-02 19:22 │ 来源:www.tikuol.com 题型:单项选择题 问题: 风机叶轮按结构特点分为开式、半开式和闭式,通常情况下为()结构形式。A、开式B、闭式C、半开式
题型:单项选择题 My father earns around 500 yuan per month, which can hardly _____ the basic needs of our family. [ ]A. approve B. cover C. present D. arrange 查看答案