题干

小刚同学用如图电路探究“一段电路中电流跟电阻的关系”。在此实验过程中,当AB两点间的电阻由5Ω更换为10Ω后,为了探究上述问题,他应该采取的唯一操作是(    )

A:保持变阻器滑片不动

B:将变阻器滑片适当向左移动

C:将变阻器滑片适当向右移动

D:将电池个数增加

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答案(点此获取答案解析)

C

同类题2

在***新时代中国特色社会主义思想指引下,广州处处见新时代新气象新作为。

材料一:以精神文明建设助力营造共建共治共享社会治理格局。广州今年建立起健全的党委领导、政府负责、社会协同、公众参与的机制,引导社会各方积极参与文明创建和社会治理。将社会主义核心价值观融入市民公约、乡规民约、行业规章等社会规范,与国家法律法规一道,有效调节社会治理中的各种关系。广州还率先把社会治理纳入文明创建测评,掀起红色文化学习热潮,用红色文化感染年轻一代,使精神文明创建活动的进程化作促进社会文明和谐的过程,提升了社会文明程度,礼让斑马线、广式排队、文明候车成为文明广州风景线。

材料二:臭涌不再臭,重现鱼儿游。小谷围街推进大学城水环境高科技治理工作,2017年底完成截污工程,今年1月下旬开始使用石墨烯光催化技术实施河涌生态修复工程,降低有机物污染,帮助水体恢复自净能力。经过治理后的北亭涌采样透明度为49cm,氨氮为6.12mg∕L(不黑不臭),总磷0.88mg∕L(三类),溶解氧3.13mg∕L。治理后的合益围涌水清岸美,成为学生跑步晨读的好去处。下一步,小谷围街将继续落实属地责任,全力推动大学城水环境治理工作,今年上半年实现大学城水环境全面提升,将大学城打造成全市河涌治理标杆。

同类题3

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    This is my origin story: when I was a teenager I wrote terrible poetry. Like really bad. Worse than yours, I bet. A lot of it about how every little thing reminds me that we're all going to die one day. I wrote collections and collections of these poems, thinking one day I would have my moment. I named one collection, ironically, The Eternal Optimist.

    In 1996, I found an advert for the International Poetry Competition. I was 16 years old and ready for my poetry to be released on the world. Not only was it a competition with a cash prize, but it was poetry, which I wrote, and international. This was my ticket to becoming world-famous. I submitted a poem called Trail of Thought. If you ever wrote bad poetry as a teenager, you'll have written something like it. In the poem, I went for a walk and noticed small poignant(辛酸的) things in nature, and each one reminded me that we were all going to die one day.

    I filled out the form, printed off the poem and sent it off, fingers crossed. I waited to hear back I carried on writing, I probably finished another collection. Then I got a letter from the International Society of Poets. I opened the envelope carefully, just in case a prize-winning cheque fell out I hadn't won. But, they liked my poem enough to include it in their anthology(诗选), Awaken to a Dream. I closed my eyes, I wanted to scream with happiness. I was going to be a published poet.

    All I had to do in order to be published was accept the terms and pay £ 45(plus £ 5 p & p)for an anthology. If I didn't buy a copy of the anthology, my poem wouldn't be included. I had to convince my mum, who thought my writing a meaningless pastime, to part with £ 50. She even asked the question: “Why do you have to pay to be in this book?” Nevertheless, she wrote a cheque for £ 50 and I returned it with my letter of agreement.

    I was 16 and about to be a published poet. This was what it had all been about. This is what it had all been leading to. The months waiting for the anthology were a torture. I hit some sort of writer's block, I couldn't write anything. It was almost as if, now I was published, it mattered more what I committed to page and I didn't want to write anything down unless it was good enough to go into an anthology like Awaken to a Dream.

    The book arrived through the post. Here it was. The first thing I had ever been published in a book called Awaken to a Dream, featuring a blistering take on the mundanity(世俗) of mortality by yours truly. I opened the package to find a book, containing my work. The first thing that struck me about the book was that it was bigger than A4. And it was thick. And on each page was a poem, next to another poem, next to another. The type was small and the paper thin enough to trace with. With three or four poems per page and more than 700 pages, I had a sinking realization. This was a scam, an illegal trick for making money.

    If each poem had cost the author £ 45, they were sitting on a fortune. I felt ashamed. Everyone who had submitted something to the International Poetry Competition had fallen for the same hustle(忙碌)as me. I couldn't bring myself to show my mum. And she never asked to see it. Perhaps she thought if the price of me learning a lesson was £50 we didn't really have, then so be it.

    But that stayed with me, that moment of realization. Because I determined to keep writing and ensure that my precious words always found a home worthy of them. Or at least that's how, more than 20 years later, I justify falling for a scam. Because your first time being published should be special, and if I don't convince myself that there was a reason for my first poem being in a vanity(无价值) book, then what good was it in the first place? And, strangely, someone is selling this book on Amazon at the moment. I wonder how many other writers who went on to do more stuff are in there.