预防子宫脱垂下列哪些正确?()
A.开展计划生育
B.提高接生技术防止产伤
C.普及产褥期知识
D.治疗慢性气管炎
E.产褥早期可以从事重体力劳动
参考答案:A, B, C, D
棘皮动物门动物的主要特征;
The most important principle in the cargo stowage is().
A.to avoid the rearrangement of the cargo loaded on board
B.to ensure the safety of the ship and cargo
C.to reject the damaged cargo during loading operation
D.to prevent the spontaneous combustion of the coal and grain