第12题: [单项选择]若统计A2~K2行中,含有“√”个数的函数正确的是(). A. count(A2:K2,“√”) B. count(A2,K2) C. countif(A2:K2,“√”) D. countif(“√”,A2:K2) 参考答案:C 答案解析:countif(range,criteria)用于对区域中满足单个指定条件的单元格进行计数.其中Range参数:是为需要计算其中满足条件的单元格数目的单元格区域,Criteria参数:为确定哪些单元格
第13题: [单项选择]What is a function of the wearing rings used in most centrifugal pumps?() A. Absorb erosion of high velocity discharge stream B. Seal pump shaft against entry of air C. Isolate the discharge side from the suction side D. Dampen the turbulent discharge flow 参考答案:C