题干

如右图所示,是中国科健股份有限公司生产的一块手机电池外壳上的文字说明:充电时电压恰为限制电压,历时4 h充满.(假设充电前电池内已无电)该过程电池发热,则充电过程中转化成的电热功率为(  )

A:0.087 5 W

B:0.007 29 W

C:0.735 W

D:0.647 5 W

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答案(点此获取答案解析)

A

同类题5

阅读下面短文,根据短文内容,从短文后各题所给的A、B、C、D四个选项中,选择最佳选项。

    The town of Pressure and the town of Pleasure were neighbors but they had nothing in common. Residents(居民) built walls to 1 influence from the other town.

    In Pressure, everyone wanted to be the very best. When women gave birth, they would compete(竞争、比赛) to have the baby with the loudest cry. There was violent competition in every aspect(方面) of life. Because 2 was the symbol(象征) of success. People were always busy making money, with no time for relaxation. Some young people couldn't bear the intensity(紧张) and chose to drink to escape(逃避).

    In Pleasure, the motto(格言) was: If only you like it, do it. People grew up without pressure and could do anything they liked. Children played computer games day and night. At school, teachers didn't care 3 students came or not. Workers might sit around the office all day long drinking coffee and doing 4 .Thanks to the lack(缺乏) of regulations(规章制度), nobody worried about losing their jobs. It was pleasure that mattered. The computers they used were old ones from the town of Pressure.

    Some of the young were addicted(上瘾) to drugs(药物)5 the emptiness(空虚) of their lives. Then, people in the two towns began asking themselves, “What is life 6 ?” But, just before life in the two towns completely7, there came a great person—Mr Reason. He went from door to door, talking with people and 8 advice. People in Pressure learnt to be satisfied with what they had 9 people in Pleasure began to make plans. They 10 the walls between them and built a road to connect the two.