I want to go outside to play _________ the snow.[ ]
A. in
B. on
C. at
答案:A
对于肺不张严重期的患者,可选择的通气模式是()
A.SIMV
B.IPPV
C.CPAP
D.IPPV+PEEP
E.PSV
具有半殖民地半封建特点的学制是( )。
A.壬寅学制B.癸卯学制C.壬子癸丑学制D.壬戌学制