Compare: the hiring choices of a monopsonistic and a competitive employer of workers. Which will hire more workers, and which will pay the higher wages? Explain.
A.仰卧位易造成仰卧位低血压,也会增加产妇骶部疼痛
B.侧卧位会促进胎JL枕后位旋转
C.半卧位对骶骨和尾骨的压力作用正常不会削弱骨盆出口的扩大
D.前倾坐位6-8次宫缩之后产程无进展,不能再采取该体位