腹外疝发病原因中最重要的是
A．腹壁强度降低B．慢性便秘C．慢性咳嗽D．排尿困难E．腹水
参考答案：A
—Could you tell me _______ Dalian?
—Last week. [ ]
A. how he returned to
B. when he left for
C. when did he leave for
386与36的积，减去36的平方，差是多少()
A．16200B．21600C．12600D．13600
