将两个铂电极插入氢氧化钾溶液中,向两极分别通入甲烷和氧气,即构成甲烷燃料电池。已

题型:选择题

问题:

将两个铂电极插入氢氧化钾溶液中,向两极分别通入甲烷和氧气,即构成甲烷燃料电池。已知通入甲烷的一极,其电极反应为:CH4 +10OH--8e-=CO32-+ 7H2O,通入氧气的一极,其电极反应式是

2O2+ 4H2O+8e-=8OH-,下列叙述正确的是[ ]

A.通入甲烷的一极为正极

B.正极发生氧化反应

C.该电池使用一段时间后应补充氢氧化钾

D.燃料电池在工作时,溶液中的阴离子向正极移动

考点:燃料电池
题型:选择题

如图,文学与艺术象一对姊妹花,发展总有一些共同的特征。从欧美文艺风格发展的历史来看,下面空格内应是      

 

A.日出•印象

B.《安娜•卡列尼娜》

C.迈克尔•杰克逊

D.马拉之死

题型:选择题

Ann and Bella are good friends. They are in the same class and sit together. After school, they often go home together. However(尽管如此), they have many different habits. On weekends, Ann likes to stay home, watch TV or sleep, but Bella often (1) ___________ (go) out to exercise. Ann eats candy every day, though she knows it’s (2) ___________ for her health. Bella likes candy, too, she only eats it (3) ___________ (one) a week, because she thinks eating less candy can help her to keep in good health.

Today is Ann’s birthday. Ann thinks Bella will buy a bag of (4) ___________ for her. But    (5) ___________ fact, Bella buys her a book. It’s about how to form good habits.

题型:选择题

“征税凭借国家政治权利,通常颁布法令实施,任何单位和个人不得违抗”。这句话表述的是税收的()特征。

A.强制性

B.无偿性

C.固定性

D.有偿性

题型:选择题

共享软件通常是________.

A.专用软件

B.数据库系统软件

C.操作系统

D.通用软件

题型:选择题

注油器由()等组成。

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