题目:
连词成句。
1. are, four, year, in, there, seasons, a
_______________________________________________.
2. is, spring, and, rainy, warm
_______________________________________________.
3. The, is, hot, sun, summer
_______________________________________________.
4. put, I, pants, on, a, sweater, and
_______________________________________________.
5. do, what, wear, you, winter, in
_______________________________________________?
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:A、根据总反应和负极反应方程式,二者相减得正极反应式为O2+2 CO2+4e-= 2CO32-,错误;B、原电池装置中阴离子向负极移动,正确;C、根据负极反应式判断电池供应1 mol水蒸气,转移的电子数为2...