被动支护
参考答案：支护系统完成后，并不立即对岩石施加压力，必须等待岩石变形产生位移之后，才对岩石本身产生压力的支护
The suits look _____ beautiful _____ I don't know _____. [ ]
A. too; to; which one to choose
B. so; that; which one to choose
C. so; that; choose which one
D. too; to; which to choose
此时最可能的诊断是
A．胎儿窘迫
B．不协调性子宫收缩过强
C．不协调性子宫收缩乏力
D．先兆子宫破裂
E．重型胎盘早剥
