滑阀是三通阀()的配件。 A.递动部 B.作用部 C.减速部 D.紧急部 发布时间:2017-08-18 19:09 │ 来源:www.tikuol.com 题型:单项选择题 问题: 滑阀是三通阀()的配件。A.递动部B.作用部C.减速部D.紧急部
题型:单项选择题 When first _____ to the market, the products didn't attract much attention.A. introducingB. introduced C. was introduced D. being introduced 查看答案