标准状态时,Eө (Ni2+/Ni)=-0.257V,Eө (Pb2+/Pb)=-0.1262V,Ni2+/Ni与Pb2+/Pb组成的原电池,正极为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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