抽油烟机是现代厨房不可缺少的用具。下表是“惠康牌”家用抽油烟机说明书中的主要技术

题型:计算题

问题:

抽油烟机是现代厨房不可缺少的用具。下表是“惠康牌”家用抽油烟机说明书中的主要技术参数表,用多用电表测得其中一只电动机的线圈电阻R=90Ω。若保险丝的熔断电流是保险丝允许通过的电流的1.5倍,启动时将电动机当做纯电阻处理,则:

(1)这种抽油烟机保险丝的熔断电流不得低于多少?

(2)两电动机每分钟消耗的电能为多少?

(3)两电动机每分钟所做的有用功是多少?

(4)这种抽油烟机的机械效率是多少?

考点:电功欧姆定律
题型:计算题
Making friends is a skill. Like most skills, it         patience(耐心). If you want to meet people and make friends, you must be willing to take some action. You must first go where there are people. You won't make friends staying home        .
Joining a club or group, talking to those who like the same things        you do is much easier. Or join someone       some activities.
Many people are shy when talking to new people.             meeting strangers means seeing the unknown. And it's human nature to feel a bit         about the unknown. Most of fears(恐惧)about             new people come from doubts(怀疑). We imagine other people are        us-finding us too tall or too short, too this or too that. But don't forget that they must be feeling the same way. Try to accept(接受)yourself      you are, and try to put the other at ease(自由自在,自然). You'll both feel more comfortable.
Try to act self-confident(自信)even if you don't feel that way when you     a room full of strangers. Walk straight, look at other people directly and       .
If you see someone you'd like to    , say something. Don't wait for        person to start a talk.
Just meeting someone        does not mean that you'll make friends with that person. Friendship is based on mutual(相互的)likings and "give and take". It takes time to       friendship.
小题1:
A.costsB.needsC.spends D.wants
小题2:
A.lonelyB.yourselfC.aloneD.with you
小题3:
A.asB.thatC.whichD.what
小题4:
A.withB.inC.onD.to
小题5:
A.At allB.For allC.In allD.After all
小题6:
A.unhappyB.usualC.upsetD.unlucky
小题7:
A.meetingB.talkingC.visitingD.speaking
小题8:
A.talkingB.sayingC.judgingD.laughing
小题9:
A.likeB.asC.whatD.that
小题10:
A.comeB.goC.enterD.step to
小题11:
A.laughB.smileC.cryD.jump
小题12:
A.speak toB.talk aboutC.say toD.call up
小题13:
A.otherB.the otherC.anotherD.others
小题14:
A.oldB.youngC.newD.little
小题15:
A.developB.startC.keepD.change
题型:计算题

解释下面句中加粗的字。

①亭亭净,可远观而不可亵玩焉。(   )

②万钟则不辨礼义而受之,万钟于我何焉!(   )

题型:计算题

如图所示装置用于测定蝗虫呼吸作用的速率,图中的NaOH溶液能够充分吸收瓶中的CO2气体,据图回答问题:(实验装置足以维持实验期间蝗虫的生命活动,瓶口密封) 

(1)该装置可测定蝗虫呼吸作用过程中吸收O2的速率还是释放CO2的速率?______.

(2)15分钟后,U形管左右两侧的管内液面位置有何改变?______.

(3)B瓶有什么作用?______.

题型:计算题

()是以法律共同体的长期实践为前提,以法律共同体的普遍的法律确信为基础

A.法官法  

B. 判例法 

C. 习惯法  

D. 成文法

题型:计算题

客户丢失密码要求重新打印密码信封,要出示()方可办理。

A.公函

B.经办人身份证

C.法人身份证

D.公函和经办人身份证

更多题库