题目: 某样品测定六次,数据如下:40.15,40.14,40.13,40.14,40.17,40.14,它的平均值为()。A.40.15B.40.145C.40.16D.40.14 答案: 参考答案:D
题型:选择题 More _____ satellites must be sent up _____ space. [ ]A. man-made; into B. manned-made; in C. man-made; inD. manned-made; into 查看答案