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问题 选择题

镍氢充电电池(Ni-MH，KOH作为电解液)已经开始用于汽油/电动混合动力汽车上，该电池的总反应方程式如下：Ni(OH)2+MNiOOH+MH(M表示储氢合金)，下列叙述正确的是 [ ]

A．放电时正、负极附近溶液的pH均不变

B．放电时正极材料为MH，发生氧化反应

C．充电时阳极反应为：Ni(OH)2+OH--e-=NiOOH+H2O

D．放电时每转移1 mol电子，负极有1 mol NiOOH被还原

答案

答案：C

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     I'm 13 years old. My name is Mike Davis. I (1)g__________ to Hope School

and I'm in Year One. I'm really interested in science, but I find maths and Chinese

very (2)d__________. I never get high marks in them. I like sports. I'm good at

(3)r__________ and I run for the school running (4)t__________ in the 800

meters every year.

     My Dad sells farm machines(农机). We live in the country about two kilometers

away (5)f__________ the school, so I go to school by (6)b__________. My uncle

has a farm(农场)and I (7)s__________ most of my free time helping him there. I

help him (8)l__________ after the cows and I like to do the milking(挤奶) every

Saturday. My uncle has a tractor(拖拉机)and he says I can't drive it until I'm fifteen

(9)y__________ old.

     I want to work in the countryside (10)w__________ I leave school. I wouldn't

like to (11)l__________ in a town or sit in an office all day. My father (12)t__________

I should work in his company, but I want to be like my uncle and have my own farm one day.
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单项选择题

以下不属于各类水工建筑物对地基基础基本要求的是( )。

A．具有足够的强度，能够承受上部结构传递的应力

B．具有足够的整体性和均一性，能够防止基础的滑动和不均匀沉陷

C．具有足够的渗透性，以免发生严重的渗漏和渗透破坏

D．具有足够的耐久性，以防在地下水长期作用下发生侵蚀破坏
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