A centrifugal bilge pump requires priming （）. ["primarily to lubricate the shaft seals","due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller","to initially unload the pump by having its head pressure equal to discharge pressure","in order to overcome the potential energy of water in the discharge line"]
说出预算定额中土壤类别的划分。
国有独资公司、两个以上的国有企业或者两个以上的其他国有投资主体投资设立的有限责任公司的董事会、监事会中（）有职工代表。 ["应当","可以","根据情况","必须"]
简述会展评估报告的主要内容。
以下哪些事故出现，风力机停机处理（） ["叶片处于不正常位置或位置与正常状态不符时","风电机组主要保护装置拒动或失灵时","风电机组因雷电损坏时","风电机组发生叶片断裂等严重机械故障时"]
青泥苔的危害是什么？
