The patient is supposed to go to the hospital for ___________ checks.

A．common

B．normal

C．regular

D．usual

若要在基本表S中增加一列CN(课程名)，可用

A．ADD TABLE S(CN CHAR(8))

B．ADD TABLE SALTER(CN CHAR(8))

C．ALTER TABLE S ADD(CN CHAR(8))

D．ALTER TABLE S (ADDCN CHAR(8))