When lowering manropes alongside a stage rigged over the side of a vessel，they should be allowed to trail in the water（）. ["to easily remove the kinks that form in the lines","to allow the seamen on the stage to know the direction and strength of the current","to provide the seaman something to hold onto if he or she falls from the stage into the water","only for short periods of time since they will become waterlogged and be very heavy to pull u"]
含鞣质类的药物不宜用哪类工具进行炮制加工（） ["木器","砂锅","铁器","瓷器"]
下列激励方式属于企业成熟阶段激励模式的是（）。 ["短期激励为主","股权激励","精神激励","技术创新激励"]
不属于影响域控制器磁盘空间因素的是（）。 ["域中使用者的数目","域中DC的处理器数目","域控制器所装载的服务","域控制器装载的应用程序目录磁盘分区"]
What type of stern tube bearing has the least friction（）. ["Oil-lubricated bearings","Lignum vitae","Hard rubber","Bronze bushing"]
设备材料有哪几类？
