订货/交货周期的持续性用运行周期按计划所规定的时间运行完毕的次数来衡量。
参考答案：对
They have no idea at all .[ ]
A. where he has gone
B. where did he go
C. which place has he gone
D. where has he gone
中上部持续剧痛，并阵发性加剧多为()
A．急性弥漫性腹膜炎
B．胆道蛔虫症
C．消化性溃疡
D．急性胰腺炎
E．肠结核
