21世纪人类社会的朝阳产业是（）。 ["文化产业","信息产业","电子计算机产业","媒体产业"]
第一代计算机使用的主要元器件为（）。 ["电子管","晶体管","中小规模集成电路","大规模和超大规模集成电路"]
If a refrigeration crankcase compressor were short cycling on the low pressure cutout switch, the cause might be that the （）. ["system was overcharged with refrigerant","system was low on refrigerant","suction valves were leaking slightly","relief valve was leaking slightly"]
人类传播演进过程中，第六个阶段是（），标志着从工业化社会到信息化社会的变革。 ["形体和信号时代","网络传播时代","文字时代","印刷时代"]
担保机构成立半年内，担保放大倍数应控制在（）倍以内。 ["3","4","5","6"]
什么是共质体途径？
