题干

要测量一个阻值约为200Ω的电阻阻值,能提供的器材有:新干电池两节、电流表一只(量程为0﹣0.6A、0﹣3A)、电压表一只(量程为0﹣3V、0﹣15V)、滑动变阻器R(100Ω 2A)一只、100Ω的定值电阻R0一只、开关和导线若干。利用上述器材设计以下电路,其中能粗略测出Rx阻值的是(    )

A:

B:     

C:

D:

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答案(点此获取答案解析)

B

同类题1

    It can be hard to meet people from another culture. From the beginning, people may send the wrong signal (信号). Or they may pay no attention to signals from another person who is trying to develop a relationship.
    Different cultures emphasize(强调)the importance of relationship building to a greater or lesser degree. For example, business in some countries is not possible until there is a relationship of trust. Even with people at work, it is necessary to spend a lot of time in “small talk”, usually over a glass of tea, before they do any job. In many European countries—like the UK or France—people find it easier to build up a lasting working relationship at restaurants rather than at the office.
    Talk and silence may also be different in some cultures. I once made a speech in Thailand. I had expected my speech to be a success and start a lively discussion; instead there was an uncomfortable silence. The people just looked at me all the time and smiled. After getting to know their ways better, I realized that they thought I was talking too much. In my own culture, we express meaning mainly through words, but people there sometimes feel too many words are not needed.
    Even within Northern Europe, cultural differences can cause serious problems. Certainly, English and German cultures share almost the same values; however, Germans prefer to get down to business more quickly. We think that they are rude. In fact, this is just because one culture starts discussions and makes decisions more quickly.
    People from different parts of the world have different values, and sometimes these values are quite against each other. However, if we can understand them better, a multicultural (多元文化) environment will offer a wonderful chance for us to learn from each other.

同类题3

阅读下面这篇文章,完成1~6题。

莲池老人

贾大山

庙后街,是县城里最清静、最美丽的地方。那里有一座寺院,坍塌的山门殿宇间,留得几处石碑,几棵松树,树顶上蟠着几枝云团似的墨绿,气象苍古如古老的诗歌。寺院西南面是个池塘,清清的水面上,有鸭,有鹅,有荷;池塘南岸的一块石头上,常有一位老人抱膝而坐,也像是这里的一个景物。寺院虽破,里面却有一座钟楼。那是唐代遗物,青瓦重檐,两层楼阁,楼上吊着一只巨大的铜钟。据说,唐代钟楼,全国只有四个半了,可谓吉光片羽,弥足珍贵。只是年代久了,墙皮酥裂,瓦垄里生满枯草。若有人走近它,老人就会隔着池塘喝喊:

 “喂——不要上去,危险——”

老人很有一些年纪了,头顶秃亮,眉毛胡子雪白,嗓音却很雄壮。文物保管所的所长告诉我,他是看钟楼的,姓杨,名莲池,1956年春天,文保所成立不久,就雇了他,每月四元钱的补助,一直看到现在。

我喜欢文物,时常到那寺院里散心。有一天,我顺着池塘的坡岸走过去。

“老人家,辛苦了。”

“不辛苦,天天歇着。”

“今年高寿了?”

“谁晓得,活糊涂了,记不清楚了。”

聊了一会儿,我们就熟了,谈得很投机。

老人单身独居,老伴儿早故去了。他的生活很简单,一日三餐,有米、面吃就行。两个儿子都是菜农,可他又在自己的院里,种了一畦白菜,一畦萝卜,栽了一沟大葱。除了收拾菜畦子,天天坐在池边的石头上,看天上的鸽子,看水中的荷叶,有时也拿着工具到寺里去,负责清除里面的杂草、狗粪。——这项劳动也在那四元钱当中。

他不爱说话,可一开口,便有自己的道理,很有趣味。中秋节前的一天晚上,我和所长去看他,见他一人坐在院里,很是寂寞。我说:

 “老人家,买台电视看吧。”

 “不买。”他说,“那是玩具。钱凑手呢,买一台看看,那是我玩它;要是为了买它,借债还债,那就是它玩我了。”

我和所长都笑了,他也笑了。

那天晚上,月色很好,他的精神也很好,不住地说话。他记得那座寺院里当年有几尊罗汉、几尊菩萨,现在有几块石碑、几棵树木,甚至记得钟楼上面住着几窝鸽子。秋夜天凉,我让他去披件衣服。他刚走到屋门口,突然站住了,屏息一听,走到门外去,朝着钟楼,放声喊起来:

 “喂——下来,那里玩不得呀!踩坏我一片瓦,饶不了你……”喊声未落,见一物腾空一跃,逃走了。我好奇怪,月色虽好,但究竟隔一个池塘呀,他怎么知道那野物上钟楼呢?他说他的眼睛好使,耳朵也好使,他有“功夫”。

可是有一天,我忽然发现他死了。那天上午,我到城外给父亲上坟,看到一棵小树下,添了一个新坟头。坟头很小,坟前立了一块砖,上写“杨莲池之墓”。字很端正,像用白灰写的。我感到太突然了,想着他生前的一些好处,就从送给父亲的冥钱里,匀了一点儿,给他烧化了……

当天下午,我怀着沉痛的心情,想再看看他的院落。一进院门,吃了一惊,屋里传出了欢笑声。推门一看,几位老人,有的坐在炕上,有的蹲在地下,正听他讲养生的道理。

我傻了似的看着他说:“你不是死了吗?”

老人们怔住了,他也怔住了。

“我在你的坟上,已烧过纸钱了!”

“哎呀,白让你破费了!”

他笑了,笑得十分快活。他说去年冬天,到城外拾柴火,见那里僻静,树木也多,一朝合了眼,就想“住”到那里去。见那里的坟头越来越多,怕没了自己的地方,就先堆了一个。老人们听了,扑哧笑了,一齐批判他:好啊,抢占宅基地!

天暖了,他又在池边抱膝而坐,看天上的鸽子,水中的小荷……有人走近钟楼,他就隔着池塘喝喊:

“喂——不要上去,危险——”

清明节,我给父亲扫墓,发现他的“坟头”没有了,当天就去问他:

“你的‘坟头’呢?”

“平了。”

“怎么又平了?”

“那也是个挂碍。”

他说,心里挂碍多了,就把“功夫”破了,工作就做不好了。

                                    (摘自《中国短篇小说百年精华》,有删改)