前置胎盘的正确处理是

A．有 * * 出血即终止妊娠

B．肛查了解宫口开大情况以决定分娩方式

C．凡胎儿死亡均从 * * 分娩

D．疑前置胎盘，肛查应轻柔

E．大出血时，不需 * * 检查，即行剖宫产

Control valves of a CO₂ system may be located within the protected space when（）.

A.it is impractical to locate them outside

B.there is also a control valve outside

C.the CO₂ cylinders are also in the space

D.an automatic heat-sensing trip is installed