作文训练是积蓄材料、思维、语言的统一。
The ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth is the（）. ["abyssal plain","continental shelf","borderland","offshore terrace"]
Under ISPS Code the ship to which it applies has to carry（） ["an International Ship Security Certificate","an International Oil Pollution Certificate","a Safety Management Certificate","an International Ballast Water Management Certificate"]
集中识字是我国传统识字形式。
船舶电工工艺即船舶电气建造工艺，是指电气作业人员在船舶建造过程中，对船舶电气进行安装调试以及维护保养等工作所必须遵循或参照的（） ["技术规范和工艺方法","技术经验","技术文件","船东指示"]
简述如何预防植物组织培养中产生褐变？
