胆怯 坦诚
Read and match. 读一读,请你把数字与相对应的序数词写在横线上。
one two three four five six second fifth
third first eight sixth eighth fourth
(7分)(1)今有氢氧燃料电池,则正极通入的气体是________,负极通入的气体是________,电解质溶液为稀硫酸时,电极反应式为:正极__________ ____负极______ ______ ____,电池的总反应式为
(2)如把H2改为甲烷、KOH作导电物质,则电极反应式为:负极_________ _______