[单选] 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（）.

Under ISM Code the ship to which it applies has to carry （） an International Ship Security Certificate。 an International Oil Pollution Prevention Certificate。 a Safety Management Certificate。 an International Ballast Water Management Certificate。 根据预防伤亡事故的原理简述事故的预防对策？ 参加辖属支行集中学习、培训时间不少于（）小时。 20。 30。 40。 60。 学习指导的实质是学习方法问题，因为学生在学习过程中都逐渐形成了各自的学习方法和习惯，它们对新的学习可能起积极的促进作用，也可能起消极的抑制作用。 简述如何预防植物组织培养中产生褐变？ 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（）.