在动物细胞培养过程中要用什么显微镜来观察细胞分裂状况？（） A.电子显微镜。 B.暗视野显微镜。 C.倒置显微镜。 D.普通光学显微镜。
You are on an ice-reinforced vessel about to enter packice. You should（）. enter the pack on the windward side where there is a well defined ice edge。 trim to an even keel or slightly down by the bow to take maximum benefit of the ice reinforcement。 take maximum advantage of coastal leads caused by offshore winds。 look for areas of rotten ice and enter perpendicular to the ice edge。
船舶报警系统手动检测应每月进行一次。
卤化烃灭火系统与CO2灭火系统一样在释放时无须用惰性气体驱动。
现代船舶对蓄电池常采用何种充电方式（） 恒流充电。 恒压充电。 快速充电。 浮充电。
Which will most likely occur when entering shallow water? （）
