底阀的作用是()。A、切断作用 B、调节流量 C、阻止介质倒流 D、泄压作用 发布时间:2018-02-16 02:23 │ 来源:www.tikuol.com 题型:单项选择题 问题: 底阀的作用是()。A、切断作用B、调节流量C、阻止介质倒流D、泄压作用
题型:单项选择题 —How long ______ Rachel and Ross ______? —It is fifty years since they ______. It is their gold marriage this year.[ ]A. has; been married; marry B. has; get married; marry C. have; married; married D. have; been married; married 查看答案