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例1(2008年广西贵港市)右图是电解水的装置,通电一段时间后,b试管中收集到的气体是_____,a试管和b试管中收集
Example 1 (Guigang City, Guangxi, China, 2008) The right figure shows the device for electrolyzing water. After energization for a period of time, the gas collected in the b-tube is _____, collected in a test tube and b test tube.