术后最早出现症状()
A．伤口疼痛
B．伤口感染
C．肺部感染
D．恶心、呕吐
E．排便困难
参考答案：A
船舶受外力作用发生横倾前后的重力（），重心横坐标（）。
A．相等；不变
B．相等；改变
C．不等；改变
D．不等；不变
He was caught by police for his drunk driving and his friend advised him to ________.[ ]
A. dry out
B. dry up
C. dry down
D. dry off
