手机银行系统全程采用()RSA非对称密码算法建立端对端的安全通道。A、128位 B、1

题型:单项选择题

问题:

手机银行系统全程采用()RSA非对称密码算法建立端对端的安全通道。

A、128位

B、1024位

C、124位

D、2024位

考点:电子产品手机银行手机银行题库
题型:单项选择题

工人利用下图所示的滑轮组将重400N的物体向上匀速提起2m,所用的拉力为250N,滑轮组的机械效率是多少?若用此滑轮组将重900N的物体竖直向上匀速提升2m,拉力在这一过程中所做的功是多少?(不计绳和摩擦)

小明的解题过程是:

解:W有用=Gh=400N×2m=800J 

 W=Fs=250N×2m×2=1000J

η=W有用/W=800J/1000J=0.8=80% 

W有用′=Gh=900N×2m=1800J

W′=W有用′/η=1800J/80%=2250J

答:滑轮组的机械效率是80%,拉力在这一过程中所做的功是2250J.

上述解答是否有错误?如果有错误,指出错误的原因,并加以纠正.

题型:单项选择题

阅读理解

     We all know how important human life is-it's priceless. It doesn't matter where you are from or what

the color of your skins is-all people are human beings. Firstly, we can tell you that the lives of your

relatives could depend on your ability to give first aid. If you think highly of human's life, this website is

for you! Here you can find information about first aid.

     The very first thing that you should do when you see an accident is to evaluate the situation and

prevent further dangerous incidents. First of all, you have to recognize what has happened and what the

dangers to rescuers and victims are. Think about how to take care of the victims.

     Helping usually takes place in very difficult conditions and injuries can be very bad. Therefore, you

cannot be too afraid of making mistakes to help. Sometimes you have to face the fact that regardless of

your actions and your efforts the victim's condition might not improve-he or she could even die. In some

cases even professional medical aid may not succeed. If you have done everything you think you should

do, you shouldn't feel guilty.

     Do not expose yourself to danger. Giving first aid can be dangerous. While trying to help a victim, do

not forget about your own safety. If something happens to you, you won't be able to help anyone.

     Call for help after you find out the condition of a victim. But remember if a victim faints due to

breathing failure caused by drowning, choking or poisoning, you should first take actions that help to

bring back the heart beat and breathing. While calling, talk shortly but clearly. Always provide the

following information: the location of the accident, the kind of accident, the number of the injured and

your full name and phone number and so on.

1. The passage is probably taken from _________.

A. a newspaper    

B. the Internet    

C. a textbook    

D. a guide book

2. The underlined word " evaluate" in Paragraph 2 is closest in meaning to _______. 

A. leave    

B. protect    

C. avoid    

D. judge

3. What's the main idea of Paragraph 3?

A. You should learn some professional knowledge about first aid.

B. You shouldn't feel guilty if you don't know about first aid.

C. Try your best to give first aid and don't be afraid of making mistakes

D. Don't make mistakes when you are giving first aid.

4. The author thinks that helping a victim can be ____________.

A. risky    

B. shocking    

C. exciting    

D. boring

5. It can be inferred from the passage that __________.

A. young people must learn how to give first aid

B. you should forget about your own safety while giving first aid.

C. when you see an accident you should do nothing but call the police.

D. when calling for help you should give all relevant details.

题型:单项选择题

以下程序运行后的输出结果是 _______ 。};main(){ struct NODEs[3]={{1,’’\0’’},{2,’’\0’’},{3,’’\0’’}},*p,*q,*r;intsum=0; s[0].next=s+1;s[1].next=s+2;s[2].next=s; p=s; q=p->next; r=q->next;sum+=q->next->num;sum+=r->next->next->num;printf("%d\n",sum);}

题型:单项选择题

消防员化学防护服适用于()事故。

A.灭火

B.处置涉及放射性物品

C.液化气体

D.化学事故

题型:单项选择题

股骨髁间骨折按骨折线可分()。

A.内外髁骨折

B.“Y”型骨折“T”型骨折

C.单髁骨折,双髁骨折

D.关节内骨折,关节外骨折

E.横断骨折,斜形骨折

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