题目

Dropping into hopelessness completely, Jack wandered on the streets, knowing he came to the end of life. In his mid-fifties, Jack had never been   41  , experienced the joy of having children or spent holidays with his family. On this miserable(悲惨的)rainy night, he felt as if there was  42  in the entire world who cared whether he lived or died. Meanwhile, I was sitting in my room watching the rain  43   my window. When I heard the doorbell ring, I   44  from my chair and raced out. But my mother was already at the door. Opening it, she found herself face-to-face w7.如图所示是一种酸性燃料电池酒精检测仪,具有自动吹气流量侦测与控制的功能.非常适合进行现场酒精检测.下列说法不正确的是(  )A.电流由O2所在的铂电极流出B.O2所在的铂电极处发生还原反应C.该电池的负极反应式为CH3CH2OH+3H2O-12e-=2CO2↑+12H+D.微处理器通过检测电流大小而计算出被测气体中酒精的含量.
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