人工推车,滑行速度不得大于()m/s。
A.3
B.5
C.7
参考答案:A
The man didn’t choose __ of the suits and went away without looking at ___ third one.
A.both; a
B.any; the
C.neither; the
D.either; a
下哪项是左心室扩大的X线征象()
A.正位上右心缘双边或双房影
B.正位上左心缘第三弓突出
C.右前斜位食管压迹加深
D.右前斜位胸骨后间隙缩小
E.左前斜位心后下缘膨隆突出