【单选题】一份试卷区分度大于0.4,说明试题的区分度
【单选题】How long a break do we need for an hour of reading?
【单选题】—_____ bread do we need, Mom? —Two kilos, I think. A. How many B. How often C. How long D. How much
【单选题】一份试卷区分度大于0.4,说明试题的区分度( )
【判断题】用法扬司法测定CL-含量时,以二氯荧光黄(Ka=1.08*10-4)为指示剂,溶液的pH值应大于4,小于10。
【判断题】用法扬司法测定Cl含量时,以二氯荧光黄(Ka=1.0×10-4)为指示剂溶液的pH值应大于4,小于10。(
【单选题】—__________ yogurt do we need? —Two cups.
【单选题】( )3.— _____ bread do we need, Mom? — Two kilos, I think. A. How many B. How often C. How long D. How much
【判断题】用法扬司法测定Cl-含量时,以二氯荧光黄(Ka=1.0010-4)为指示剂,溶液的PH值应大于4,小于10。( )