题干

在图中,补上适当的导线,使L1和L2并联,开关控制L1和L2,电流表测量L2中的电流.

上一题 下一题 0.0难度 选择题 更新时间:2018-07-09 08:09:06

答案(点此获取答案解析)

解:如图所示:

同类题2

阅读理解

    What is the hottest topic at your school recently? In Taiyuan No.55 Middle School,it's money.

    The school held an activity called “making money” last weekend.About 200 Junior 1 and Junior 2 students were divided into 30 teams.They went out to make money by selling things.

    What did they choose to sell? Some sold newspapers;some chose bottled water;some sold environmentally friendly shopping bags and bamboo bamboo baskets.

    Hu Qing's team decided to sell some useful books in front of the Children Activity Center.They thought parents would like to buy the books for their children.But unfortunately,they met urban management officers(城管).The officers asked them to leave.“ We played hide-and-seek(捉迷藏)with the officers for the whole morning”said Hu. “Finally we had to give up.”

    Wang Bing and her team sold ice cream in a square.They didn't meet any officers.But few people were interested in what they were selling.The team then put up a board saying “For Country Kids”.It worked.More people came to their stall(小摊).A foreigner even gave them 100 yuan. “He didn't want any change.He said he wanted to help the children,” said Wang.“ We were touched.” Later that day they gave the 100 yuan and more to the “Project Hope” office.

    Meng Zhaoxiang and his team were luckier.They sold all their cakes in four hours,spending 39.5 yuan and getting back 80 yuan.They made 40.5 yuan.“It was not easy to make the money,” said Meng.“ Some people just looked.Others just tasted but didn't buy.Now I know how hard it is for our parents to make the money we need to lead happy lives.”

同类题3

阅读下面的文言文,完成下列小题。

    张种,字士苗,吴郡人也。祖辩,宋司空右长史、广州刺史。父略,梁太子中庶子、临海太守。种少恬静,居处雅正,不妄交游,傍无造请,时人为之语曰:“宋称敷、演,梁则卷、充①。清虚学尚,种有其风。”仕梁王府法曹,迁外兵参军,以父忧去职。服阕,为中军宣城王府主簿。种时年四十余,家贫,求为始丰令,入除中卫西昌侯府西曹掾。时武陵王为益州刺史,重选府僚,以种为征西东曹掾,种辞以母老,抗表陈请,为有司所奏,坐黜免。

    侯景之乱,种奉其母东奔,久之得达乡里。俄而母卒种时年五十而毁瘠过甚又迫以凶荒未获时葬服制虽毕而居处饮食恒若在丧。及景平,司徒王僧辩以状奏闻,起为贞威将军、治中从事史,并为具葬礼,葬讫,种方即吉。僧辩又以种年老,傍无胤嗣,赐之以妾,及居处之具。

    贞阳侯僭位,除廷尉卿、太子中庶子。敬帝即位,为散骑常侍,迁御史中丞,领前军将军。高祖受禅,为太府卿。天嘉元年,除左民尚书。二年,权监吴郡,寻征复本职。迁侍中,领步兵校尉,以公事免,白衣兼太常卿,俄而即真。废帝即位,加领右军将军,未拜,改领弘善宫卫尉,又领扬、东扬二州大中正。高宗即位,重为都官尚书,领左骁骑将军,迁中书令,骁骑、中正并如故。以疾授金紫光禄大夫。

    种沈深虚静,而识量宏博,时人皆以为宰相之器。仆射徐陵尝抗表让位于种曰:“臣种器怀沈密,文史优裕,东南贵秀,朝庭亲贤,克壮其猷,宜居左执。”其为时所推重如此。太建五年卒,时年七十,赠特进,谥曰元子。

    种仁恕寡欲,虽历居显位,而家产屡空,终日晏然,不以为病。太建初,女为始兴王妃,以居处僻陋,特赐宅一区,又累赐无锡、嘉兴县侯秩。尝于无锡见有重囚在狱,天寒,呼出曝日,遂失之,世祖大笑,而不深责。有集十四卷。

(选自《陈书》列传第十五,有删改)

【注释】①敷、演和卷、充均为人名。