肺炎支原体的发病机理与直接毒性和免疫损伤有关。()
参考答案:对
I know Mr. Brown; we ______ to each other at an international conference.
A.are introduced
B.are been introduced
C.were introduced
D.had been introduced
Access提供的数据类型中不包括(’ )。
A.备注
B.文字
C.货币
D.日期/时间