A:A炉的电热丝细而长,B炉的短而粗
B:A、B两电炉电热丝长短、粗细都一样,只是A排列得比B密
C:如果两个炉丝粗细一样,则A的短、B的长
D:如果两个炉丝长短一样,则A的粗、B的细
①认识到学习的过程就是一种艰苦的脑力劳动
②认识到学习是一个探究和发展的过程,需要克服困难,刻苦努力
③认识到克服了一个困难就能获得一种新的知识、发现自身的潜能、获得超越自己的快乐
④认识到学习只有苦没有乐
在如图所示的电路中,电源电压恒定,R1为一定值电阻,R2为滑动变阻器.开关S闭合后,当滑动变阻器的滑片P在a、b之间滑动的过程中,电压表的示数最大为4 V,电阻R1的电功率变化范围是0.8 W~0.2 W,则电源电压是()
I like to have friends who are like me. I'm quieter than most of the kids in my class, and my best friend Yuan Li is quiet, too. There are some differences, though. I'm smarter than Yuan LI. she is more athletic.
James Green
It's not necessary to be the same. I like to have friends who are different from me. My best friend Larry is taller and more outgoing than me. We both like sports, but Larry is more athletic than me. He always beats(赢) me in tennis. Also, I'm quieter than he is.
Huang Lei
I don't really care. My best friend is Carol. Carol is very funny, and more outgoing than I am. But we both like doing the same things. I don't think differences are important in a friendship(友谊).
Mary Smith