单次测量值与算术平均值的差称为().
A、残差
B、方差
C、极差
参考答案:A
-Does he play sports?
-No, __________. He only watches them ________TV. [ ]
A. he does, on
B. he doesn't, in
C. he doesn't,on
康有为创办、发行的报纸是()。
A.《万国公报》
B.《强学报》
C.《时务报》
D.《民报》