甲、乙两台热机,甲的效率比乙的低,其含义是( ) A.甲热机消耗的燃料多 B.甲 发布时间:2017-08-02 22:32 │ 来源:www.tikuol.com 题型:选择题 问题: 甲、乙两台热机,甲的效率比乙的低,其含义是( )A.甲热机消耗的燃料多B.甲热机比乙热机做功少C.甲热机的功率比乙热机的小D.做相同的有用功,甲损失的能量比乙损失的多
题型:选择题 —What _______ the number of the students in your school?—About two thousand. A number of them _______ from the countryside.A.is; ,areB.is; isC.are; isD.are; are 查看答案