打开证书控制台需要运行（）命令。
A.certmgr.msc
B.wiaacmgr
C.devmgmt.m
D.secpol.m
参考答案：A
He caught a bad cold. He ______on more clothes that day. [ ]
A. should have put
B. should have putted
C. had put
D. was put
在SQL中，下列涉及空值的操作中错误的是______。
A) AGE IS NULLB) AGE IS NOT NULLC) AGE=NULLD) NOT(AGE IS NULL)
