21的所有因数是3,7,21。[ ]
错误
Mike _____ his wedding for a whole month and hopefully everything will be ready tomorrow. [ ]
A. prepares
B. is preparing
C. had prepared
D. has been preparing
复查时最重要的项目是
A.血尿常规B.胸部X线检查C.局部检查D.血碱性磷酸酶测定E.尿本-周蛋白测定