已知集合U={1,2,3,4},CUB={2,3},则集合B=( )
A.{2}
B.{2,3}
C.{1,4}
D.{1,2,3}
根据补集的定义得出B={1,4}.
故选C.
They are broadening the bridge to ________ the flow of traffic.
A.put off
B.turn on
C.speed up
D.work out
在喉外伤整复手术中,应特别注意防止术后()
A.再次出血
B.异物未完全取净
C.喉狭窄
D.减少吞咽,以利愈合
E.鼻饲