亚音速一元等熵气流在渐扩管道中随截面积增大,温度T()。 A.减小 B.增大 C.不 发布时间:2018-02-12 21:56 │ 来源:www.tikuol.com 题型:单项选择题 问题: 亚音速一元等熵气流在渐扩管道中随截面积增大,温度T()。A.减小B.增大C.不变D.不确定
题型:单项选择题 —I borrowed two books from the library yesterday. —Be careful. If you lost it you must _____ it.[ ]A. pay B. pay for C. cost D. spent