NCCLS所规定的二级水的电阻率(MΩ/cm,25℃)为() A.6.0 B.5.0 发布时间:2017-06-01 03:00 │ 来源:www.tikuol.com 题型:单项选择题 问题: NCCLS所规定的二级水的电阻率(MΩ/cm,25℃)为()A.6.0B.5.0C.2.0D.1.0E.0.5
题型:单项选择题 It was ________ he came back from Africa that year ________ he met the girl he would like to marry.[ ]A.when; then B.not; untilC.not until; that D.only; when 查看答案