题干

下列说法中正确的是( )


A:物理学中规定正电荷定向移动的方向为电流的方向

B:用电器是将其他形式的能转化为电能的装置

C:导体有电阻,绝缘体没有电阻

D:导体两端电压为零,电流为零,电阻不一定为零

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答案(点此获取答案解析)

A,D

同类题3

阅读下列材料:

材料一:(北宋)中央政府继续刻印图书,除国子监承刻之外,其他政府部门和地方官署都刻书、印书,全面开展了政府刻书事业……刻书内容范围更加扩大,不仅刻印儒家经典著作,又遍刻正史、医书、诸子、算书、字书、类书和名家诗文,政府还编印了四部大型类书以及佛、道藏经典。私人刻书以文集最多,坊间刻书则以售卖营利为主,除了刻印经文以外,又另刻有字书、小学等民间所需用及士子应举所需要的读物,品类丰富繁多。

——张树栋《中华印刷通史》

材料二:谷登堡的印刷术一经发明,立即以惊人的速度普及开来,20年间就传遍了欧洲。15世纪末,欧洲大约有3万种,2 000多万册书籍被印刷发行,印刷种类也从宗教文件扩大到自然科学、哲学、文学和教科书,广泛地传播了新的信息和长期被垄断的知识……1474年,距(欧洲)活字印刷术发明仅30年,欧几里德的《几何原本》的活字印刷版就发行了,哥白尼的《天体运行论》在他生前就有了活字印刷版,他是抚摸着他的著作的印刷本去世的……印刷机的出现,使“危险思想”的传播变得对统治阶级更加危险了。在欧洲的封建统治者看来,哲学和自然科学的新思想是异端邪说,必须禁止其发表。

——饶立华《谷登堡的印刷术与大众传播》

请回答:

同类题4

阅读下面短文,掌握其大意,然后从各题所给的A、B、C、D四个选项中,选出最佳选项。

    No one is born a winner. People make themselves into winners by their own 1.

    I learned this lesson from a(n)  2 many years ago. I took the head 3job at a school in Baxley, Georgia. It was a small school with a weak football program.

    It was a tradition for the school's old team to play against the 4 team at the end of spring practice. The old team had no coach, and they didn't even practice to 5the game. Being the coach of the new team, I was excited because I knew we were going to win, but to my disappointment we were defeated. I couldn't 6 I had got into such a situation. Thinking hard about it, I came to 7 that my team might not be the number one team in Georgia, but they were 8me. I had to change my 9about their ability and potential.

    I started doing anything I could to help them build a little  10 .Most important, I began to treat them like 11 .That summer, When the other teams enjoyed their 12 ,we met every day and 13passing and kicking the football.

    Six months after suffering our 14on the spring practice field, we won our first game and our second, and continued to15.Finally, we faced the number one team in the state. I felt that it would be a 16for us even if we lost the game. But that wasn't what happened. My boys beat the best team in Georgia, giving me one of the greatest17my life!

    From the experience I learnt a lot about how the attitude of the leader can 18 the members of a team. Instead of seeing my boys as losers, I pushed and19them. I helped them to see themselves 20 ,and they built themselves into winners.

    Winners are made, but born.