已知一组数据1,2,2,0,-1,-2,0,-1,则这组数据的平均数为( ),众数为( ),中位数为( ),方差为( )。
0;0、-1和1;0;;
Not until the train pulled into the station that his suitcase was gone.
A.had he found
B.did he find
C.he had found
D.he found
在实际工作中坚持唯物主义就是( ).
A.一切从理论出发
B.不唯上,不唯书,只唯实
C.使主观意志得到发现
D.调和主观思想和客观实际