盐酸:酸A.食盐:盐 B.纯碱:碱 C.白金:金 D.王水:水 发布时间:2017-05-30 17:24 │ 来源:www.tikuol.com 题型:单项选择题 问题: 盐酸:酸A.食盐:盐B.纯碱:碱C.白金:金D.王水:水
题型:单项选择题 下列各组离子在指定溶液中,能大量共存的是 [ ]A.pH=0溶液:Fe3+、Mg2+、B.滴加甲基橙显红色的溶液:Ca2+、K+、 C.1KI溶液中:Cu2+、Fe3+、D.c(NH3·H2O)=1的溶液中:、Al3+、 查看答案
题型:单项选择题 I haven' t seen Mary these past few days. I m afraid she ____ herself for some time.A.isn't feelingB.hasn' t been feelingC.hadn't been feelingD.wasn't feeling 查看答案
题型:单项选择题 城镇初始地籍调查成果检查要求,验收时,内业抽检(),外业实际操作抽查比例视内业抽查情况决定,一般为3%~5%。A.3%~5%B.30%~50%C.30%~70%D.20%~60% 查看答案