属于中等强度作业()
A.氧需不超过氧债
B.氧需几乎等于氧债
C.氧需超过氧债
D.氧需不超过氧上限
E.氧需超过氧上限
参考答案:D
We all feel it is Jack as well as his wife that ______ for their son’s bad performance at school.
A.are to blame
B.is to be blamed
C.are to be blamed
D.is to blame
中国移动通信集团公司成立于()