Before welding can be done in a tank that has carried petroleum products，a certificate must be obtained from（）. ["the Customs","the Register Bureau of Shipping","the Shipyard Fire Department","a certified gas chemist"]
99尾箱重要空白凭证限额按总行相关规定执行。如遇特殊情况超出限额，应附情况说明，由（）审批，与该柜员“尾箱实物清单”一并保管，以备查考。 ["网点负责人","主管柜员","02级柜员"]
我们日常所见到的苔藓植物多数生长在潮湿的环境中或至少在某一时期有降雨的环境中，你认为与该特征有联系的最重要原因是什么：（） ["苔藓植物没有根的分化，只有假根","苔藓植物体内没有维管组织的分化","苔藓植物个体小，雌雄异株","苔藓植物受精作用离不开水"]
All personnel should be familiar with the lifeboats （） ["boarding and operating procedures","maintenance schedule","navigational systems","fuel consumption rate"]
已知AB基因之间的图距为20厘摩，从杂交后代测得的重组值为18%，说明其间的双交换值约为：（） ["1%","2%","4%","无法确定"]
海西运动对亚洲大陆的形成有哪些影响？
