对准备停电作业的电气设备，必须把各（）线的电源完全断开。 ["进","出","进出","任意"]
井下各种有害气体的允许浓度各为多少？
个人之间、个人与单位之间的土地权属争议，由（）级人民政府或者（）级以上人民政府处理。
科学与（）并不冲突。 ["怀疑论","知识论","进化论","融贯论"]
Uncle Sam sent him a（）bicycle as a birthday present. ["red sports new","sports new red","new sports red","new red sport"]
简述水系的概念。
