若am=2,an=3,则am+n等于( )
A.5
B.6
C.8
D.9
∵am•an=am+n,am=2,an=3,
∴am+n=2×3=6.
故选B.
I ___________ that work last week, but I changed my mind.
A.were to accept
B.was to accept
C.was to have accept
D.had accepted
以下哪项是MODS呼吸支持的重点()
A.增加氧供
B.降低氧耗
C.防治ARDS
D.改善通气
E.防治呼吸机相关性肺炎