A. excess stresses will not be set up in the boiler B. the decks will not be covered with soot C. the soot will be swept toward the uptakes D. there will not be a loss of steam pressure
A. 血管内插管 B. 空气感染 C. 无菌操作不严 D. 交叉感染 E. 保留导管
A. 保护接地 B. 保护接零 C. 保护断开 D. 加强电气设备的维护维修