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举一反三
【单选题】In many places water is becoming scarcer. Treating it as a right makes the scarcity worse. Ideally, efficient water use would be encouraged by charging for it, but attempts to do so have mostly proved...
A.
People should only be entitled to certain amount of water free.
B.
People can borrow water from their neighbors when necessary.
C.
People are free to bargain for water in market in their daily lives.
D.
People have the right to trade water to raise water productivity.
【单选题】有三个电池 设这三个电池中各物质浓度都是0.1molL-1，则它们的（）
A.
电池反应式不同，ε不同
B.
电池反应式不同，ε相同
C.
电池反应式相同，ε相同
D.
电池反应式相同，ε不同