“Stand by engine” means （）. ["prepare to stop the engine","assemble an engine on its bedplate","make an engine ready for starting","make an engine run steadily"]
商业计划书摘要的格式和内容不完全一样，但至少要包括的基本内容为（） ["管理团队","收益","产品的唯一性","退身之路","机会和风险"]
无线调度命令传送系统为含（）、（）、调车作业通知单、列车接车进路预告信息的无线传送系统。
Smaller engines can be made more rigid than large ones and may not have （）. ["through bolts","turbo-chargers","bed plates","colum"]
Once vessel has been cleared by Port Health or Immigration （）must proceed to appropriate berth or anchorage． ["It","she","he","the vessel"]
痕量元素表面富集理论
