【单选题】We should keep our classroom _____. [ ]
【单选题】We should keep our classroom _____.
【单选题】Every day we should keep our classroom _________. [ ]
【单选题】We should always keep the classroom ________ and tidy.
【简答题】只有当加权调和平均数指数的权数为( )时,才与派氏指数等价。
【多选题】加权调和平均指数公式中( )。
E.
加权调和平均指数在某种意义上是质量指标综合指数的变形
【单选题】We should keep our classroom ____ .