锅炉中沉结水垢的物质是( )。A.钙镁盐 B.钠盐 C.铝盐 D.铁盐 发布时间:2018-07-17 02:41 │ 来源:www.tikuol.com 题型:单项选择题 问题: 锅炉中沉结水垢的物质是( )。A.钙镁盐B.钠盐C.铝盐D.铁盐
题型:单项选择题 He has already gone home. But before he left, he__________ all the mistakes in his translation.A.had correctedB.has correctedC.correctedD.would correct 查看答案