函数f(x)=(x-3)ex的单调递增区间是 ( ▲ )
A.(-∞,2)
B.(0,3)
C.(1,4)
D.(2,+∞)
答案:D
.令
得,所以单调递增区间是(2,+∞) 故选D
Because excessively hunting has depleted many wildlife species, game preserves are being established.
A.excessive hunting
B.hunting excessively
C.hunting was excessive
D.they hunted excessively
浓密的积雨云由许多云朵组成,聚集着大量的()
A.正电荷
B.正负电荷
C.负电荷