水压试验用水必须是( )。 A.酸性水 B.碱性水 C.重水 D.清洁水 发布时间:2017-05-02 13:10 │ 来源:www.tikuol.com 题型:单项选择题 问题: 水压试验用水必须是( )。A.酸性水 B.碱性水C.重水 D.清洁水
题型:单项选择题 When ________different cultures, we often pay attention only to the differences without noticing the many similarities.[ ]A. compared B. being comparedC. comparing D. having compared 查看答案