台湾岛的自然灾害主要是( )
A.沙尘暴
B.低温寒潮
C.干旱
D.地震台风
地震、台风是台湾岛的主要自然灾害.
故选:D.
—Does your friend like salad?
— _________. [ ]
A. Yes, she like.
B. No, she does.
C. Yes, she doesn't
D. No, she doesn't.
设A、B均为n阶非零矩阵,且AB=0,则R(A),R(B)满足()。
A.都小于n
B.必有一个等于0
C.一个小于n,一个等于n
D.都等于n