题干

如图表示一交流电的电流随时间而变化的图象,此交变电流的有效值是(   )

A:52A

B:5A

C:3.52A

D:3.5A

上一题 下一题 0.0难度 选择题 更新时间:2015-07-08 03:15:33

答案(点此获取答案解析)

B

同类题2

完形填空

    In our country we think being modest(谦虚的) is a virtue(美德) and being proud is a bad thing. One day, I heard an American boy say to a Chinese student, “you speak very good English.” But the girl answered, “No, no. My English is very poor.” The foreigner was quite 1at the answer. Thinking he had not made himself understood or the girl had not heard him 2 He said, “Yes, indeed, you speak very well.”3 the girl still kept saying. “No.” In the end the American boy could not understand and didn't know 4 to say.

    What's wrong with the girl's answer? She didn't 5a compliment(恭维) in the same way as the American people do. She should answer “Thank you” instead of “No.” She 6 understood what the American boy had said, but she thought she should be modest. In the 7 people will feel 8 and confident when they are praised. So if someone says the 9 you have cooked are very delicious, you should say, “Thank you”.

    If you are modest and say. “No, I'm 10 I can't do it well”, while working in a western country, people may think that you really can not do it. If you often say, “No”, you'll certainly be looked down upon by 11 When asking 12 a job, if one says something like, “Yes, I can certainly do it” instead of “ Let me have a try”, he or she will13 get it. So in the west, you should be brave to show your self-confidence. In my opinion, being confident doesn't 14 being proud, so sometimes you should be confident15 being modest.

同类题4

阅读下面的文言文,回答相关问题
     秦王使人谓安陵君曰:“寡人欲以五百里之地易安陵,安陵君其许寡人!”安陵君曰:“大王加惠,以大易小,甚善;虽然,受地于先王,愿终守之,弗敢易!”秦王不悦。安陵君因使唐雎使于秦。   
     秦王谓唐雎曰:“寡人以五百里之地易安陵,安陵君不听寡人,何也?且秦灭韩亡魏,而君以五十里之地存者,以君为长者,故不错意也。今吾以十倍之地,请广于君,而君逆寡人者,轻寡人与?”唐雎对曰:“否,非若是也。安陵君受地于先王而守之,虽千里不敢易也,岂直五百里哉?”
      秦王怫然怒,谓唐雎曰:“公亦尝闻天子之怒乎?”唐雎对曰:“臣未尝闻也。”秦王曰:“天子之怒,伏尸百万,流血千里。”唐雎曰:“大王尝闻布衣..之怒乎?”秦王曰:“布衣之怒,亦免冠徒跣,以头抢地耳。”唐雎曰:“此庸夫之怒也,非士之怒也。夫专诸之刺王僚也,彗星袭月;聂政之刺韩傀也,白虹贯日;要离之刺庆忌也,仓鹰击于殿上。此三子者,皆布衣之士也,怀怒未发,休祲降于天,与臣而将四矣。若士必怒,伏尸二人,流血五步,天下缟素,今日是也。”挺剑而起。            
     秦王色挠,长跪而谢之曰:“先生坐!何至于此!寡人谕矣:夫韩、魏灭亡,而安陵以五十里之地存者,徒以有先生也。”(节选自《 唐雄不辱使命》 )

同类题5

课外迁移拓展阅读:阅读短文,完成小题。
                                                                                                               眼 睛
       黄昏,诗人常到湖边公园寻找灵感。公园有几排长椅,一对对亲密偎依的情侣给美丽的日落景观增添了一种浪漫的情调。诗刊上便常出现这位诗人写的爱情诗。
        一天黄昏,一条长椅上出现了一个长发姑娘。她的背影看上去很美。别的椅子上都是坐着一对,形单影只的她自然引起诗人的注意。于是诗人就朝她走了过来,这才发现她有一双好美的眼睛:似清泉、似山溪、似月光下的水波…… 甲 
        姑娘端坐着一动也不动,神色沉静,似陶醉在日落的美景中……诗人回去了,就写了一首关于她眼睛的诗。
       此后,诗人每天黄昏都到公园去,那姑娘也总是端坐在那儿。诗人感觉到自己心里已有一种强烈的渴望。终于,他控制不住自己了,让自己写的有关她眼睛的诗做媒,去和她相识。
        然而,姑娘的话让诗人大吃了一惊——“其实我的眼睛什么也看不见,我是个盲女。”诗人不信。“我何必骗你。”姑娘认真地说。诗人心里的渴望很快退潮般消失……诗人好久没再去公园。
        一个月后,诗人又到公园去。那姑娘还是坐在那儿,只是身旁多了个英俊的小伙子。那个小伙子搂着姑娘的肩头,很亲密,诗人不由自主地走过去……
       “我是个盲人,你不后悔?永远不后悔?”小伙子回答:“我就是你的眼睛!”
        听了这句话“我就是你的眼睛”, 乙 ,好诗!
        然而,诗人并没用笔把这首诗写出来,只是默写在他心里。
        诗人又好久没有到公园去过。当他再一次去公园见到那姑娘已是三个月之后。那天,黄昏的景色很美:燃烧的斜阳,朦胧的远山,展翅的白鹤,平静的湖水闪着金光……可是,姑娘身旁却没了那英俊的小伙子,诗人怀着一种异样的心情走了过去,发现在姑娘俊俏的脸上有两道泪痕。
       “你……怎么啦?”
       “你,你是谁?”姑娘问。
        “我是那个……诗人。你男朋友呢?”
        姑娘沉默了一阵,才开了口:“车祸……死了。两个月前,我们去登记结婚,为了救一个小孩,他……” 丙 ,然后在姑娘身旁坐了下来。
       不知过了多久,诗人终于鼓起了勇气,说“我愿意……做你的眼睛。”“我有眼睛。”姑娘顿了一下,接着说,“他临死前,要求医生把眼角膜移植给我,手术成功了。是他给了我一双眼睛……”从此,诗人不再写诗了。