A:正极反应式为:2H+ +2e— =H2↑
B:乙电极为电池的负极,b处通入的物质是空气
C:负极反应式为:CH3OH+H2O-6e—=CO2+6H+
D:在电池反应中,每消耗l mol氧气,理论上能生成标准状况下CO2气体22.4L
如图所示,以8m/s匀速行驶的汽车即将通过路口,绿灯还有2 s将熄灭,此时汽车距离停车线18m。该车加速时最大加速度大小为2m/s,减速时最大加速度大小为5m/s2。下列说法中正确的是( )
下列句子没有语病的一项是( )
标语中“停止内战,一致抗日”的愿望得到初步实现的标志性事件是( )
根据句意,写出括号内所给单词的适当形式。It's my cousin's ____ (twenty) birthday next week.The weather in Nanjing is ____ (pleasant) in summer. It's always too hot.People screamed with____ (excite) when the match began.He was so tired that he fell____ (sleep) soon after he went to bed.