下列试剂中,能把Na2CO3溶液、稀盐酸、BaCl2三种溶液一次鉴别出来的是 A 发布时间:2017-07-07 20:55 │ 来源:www.tikuol.com 题型:选择题 问题: 下列试剂中,能把Na2CO3溶液、稀盐酸、BaCl2三种溶液一次鉴别出来的是A.稀硝酸B.Ca(OH) 2溶液C.AgNO3溶液D.H2SO4溶液
题型:选择题 --- I hear Robert has gone to Harvard University for his master’s degree. --- Oh, how nice! Do you know when he ____?A.was leavingB.leftC.had leftD.has left 查看答案