問題詳情
己知長方形周長為 60 公分,如果長方形的寬為 χ,則長方形面積是多少平方公分?
(A)30 - x
(B)60 - x
(C)(30 - x) x
(D)(60 - x) x
(A)30 - x
(B)60 - x
(C)(30 - x) x
(D)(60 - x) x
參考答案
答案:C
難度:簡單0.789474
統計:A(18),B(15),C(330),D(44),E(1)
內容推薦
- 十七届三中全会通过的《中共中央关于推进农村改革发展若干重大问题的决定》要求,到2020年农民人均______比2008年翻一番。(A)土地收入 (B)粮食产量 (C)纯收入 (D)非农收入
- 轴核裂变是核电站核能的重要来源,其一种裂变反应是 下列说法正确的有(A)上述裂变反应中伴随着中子放出B .铀块体积对链式反应的发生影响(C)铀核的链式反应可人工控制(如核电站、核潜艇等)(D)铀
- 关于蛋白质生物合成的叙述,正确的是( )(A)一种tRNA可以携带多种氨基酸(B)DNA聚合酶是在细胞核中合成的(C)反密码子是位于mRNA上相邻的三个碱基(D)线粒体中的DNA能控制某些蛋白质的
- 恩格斯说:“鹰比人看得远得多,但是人的眼睛识别的东西远胜于鹰。狗比人具有锐敏得多的嗅觉,但是它连被人当作为各种物的特定标志的不同气味的百分之一也辨别不出来。”人的感官的识别能力高于动物,除了人脑及
- 对于常温下pH为2的盐酸,叙述正确的是(A).c(H+)=c(Cl-)+c(OH-)(B).与等体积pH=12的氨水混合后所得溶液显酸性(C).由H2O电离出的c(H+)=0×10-12mo
- 21.如图9,两个初速度大小相同的同种离子a和b,从O点沿垂直磁场方向进人匀强磁场,最后打到屏P上。不计重力。下列说法正确的有 A.a、b均带正电 B.a在磁场中飞行的时间比b的短 C.a在磁场中飞行
- 下列文献中,有较多反应西周时期平民社会生活内容的是(A)《老子》 (B)甲骨卜辞 (C) 《诗经》 (D) 《楚辞》
- 图5是某种静电矿料分选器的原理示意图,带电矿粉经漏斗落入水平匀强电场后,分落在收集板中央的两侧,对矿粉分离的过程,下列表述正确的有 (A).带正电的矿粉落在右侧 (B).电场力对矿粉做正功 (C
- 如图5,理想变压器原、副线圈匝数比n1:n2=2:1, 均为理想电表,灯光电阴R1=6Ω,AB端电压u1= sin100πt(V).下列说法正确的是 (A) 电流频率为100HZ (B) 的读数
- Millions of Americans and foreigners see GI. Joe as a mindless war toy, the symbol of American milit
內容推薦
- 我国数学家华罗庚再一次报告中以“一支粉笔多长为好”为例来讲解他所倡导的选法,对此,他解释道:“每支粉笔都要丢掉一段一定长的粉笔头,但就这一点来说愈长愈好。但太长了,使用起来很不方便,而且容易折断。
- 1.中共中央决定,从2005年1月开始,用一年半左右的时间,在全党开展以实践“三个代表”重要思想为主要内容的 教育活动。(A)保持共产党员先进性 (B)立党为公,执政为民 (C)严肃党的纪律 (D)全
- Progress so far very good and we are sure that the work will be finished on time.(A) was (B) had
- 1.2006年7月1日至2007年12月31日,全国进行 换届选举。本次选举涉及选民约9亿,产生代表200多万人。(A)市县两级人大 (B)市县两级政协(C)农村村民委员会与城市居民委员会 (D)县乡
- The children loved their day trip, and they enjoyed the horse ride .(A) most (B) more (C) less (D
- It’s high time you had your hair cut ; it’s getting .(A) too much long (B) much too long(C) long
- All the dishes in this menu, otherwise stated, will serve two to three people.(A) as (B) if (C)
- —— Do you mind my opening the window? It’s a bit hot in here.—— , as a matter of fact(A) Go ahea
- I’m sure that your letter will get attention. They know you’re waiting for the reply.(A) continu
- 請選出下列正確的敘述?(A)一個數愈小,它的質因數就愈少(B)一個數是9的倍數就一定是6的倍數(C)一個數是9的倍數就一定是3的倍數(D)一個數是3的倍數就一定是9的倍數
- I can’t leave. She told me that I stay here until she comes back.(A) can (B) must (C) will (D) m
- One of my father’s favorite sayings as I was growing up was “Try it!” I couldn’t say I didn’t like
- Jenny nearly missed the flight doing too much shopping.(A) as a result of (B) on top of (C) in f
- . I know what you’re thinking : pizza (比萨饼)? For breakfast? But the truth is that you can have last
- What I need is book that contains ABC of oil painting.(A) a; 不填 (B) the; 不填 (C) the; an (D) a ;
- It is often that human beings are naturally equipped to speak.(A) said (B) to say (C) saying (D)
- What can we infer from the text?(A) Working women usually have breakfast in a hurry.(B) Many
- According to the last paragraph, it is important to____________.(A) eat something for breakf
- The text is written mainly for those_____________.(A) who go to work early (B) who want to l
- Having a husband means an extra seven hours of housework each week for women, according to a new stu
- How many hours of housework did men do every week in the 1970s?(A) About (B) About (C
- What kind of man is doing most housework according to the text?(A) An unmarried man. (B) An
- What can we conclude from Stafford’s research?(A) Marriage gives men more freedom.(B) Marria
- GUATEMALA CITY (Reuters) – A fish that lives in mangrove swamps(红树沼泽)across the Americas can live ou
- —Is it all right if I keep this photo?--¬¬¬¬¬¬_______.(A) No,you don’t (B) No, it shouldn’t (C) I’