简述主动运输特点。
DHS模型
大型游乐设施按类别包括观览车类、滑行车类、架空游览车类、陀螺类、飞行塔类、转马类、自控飞机类等共14个类。下列哪项属于滑行车类游乐设施() ["激流勇进;","电力驱动小火车;","电力双轨列车系列;","旋转飞椅系列。"]
What occurs on a Frame Relay network when the CIR is exceeded?() [" All TCP traffic is marked discard eligible."," All UDP traffic is marked discard eligible and a BECN is sent."," All TCP traffic is marked discard eligible and a BECN is sent."," All traffic exceeding the CIR is marked discard eligible."]
赵某投保了一份终身寿险险合同,2001年1月5日赵某应缴费而未缴费。
赵某的合同在2002年1月还有效吗?如果已无效,还能恢复合同吗?
简述吸附法的定义和特点。