随身携带有效的()合格证。

题型:填空题

问题:

随身携带有效的()合格证。

考点:焊工技能考试电气焊工理论考试电气焊工理论考试题库
题型:填空题

某种电脑病毒传播非常快,如果一台电脑被感染,经过两轮感染后就会有81台电脑被感染。请你用学过的知识分析,每轮感染中平均一台电脑会感染几台电脑?若病毒得不到有效控制,3轮感染后,被感染的电脑会不会超过700台?

题型:填空题

When a storm is coming, most people leave the area as quickly as possible and head for safety…But there are a few people who will get into their cars and go straight for the center of the storm.These people are willing to risk being killed by floods or 100-Kilometer- an-hour winds for the excitement of watching the storm close up.

  “Storm chasing (追逐)”is becoming an increasingly popular hobby,especially in the Midwest of the United States, where there are frequent storms between March and July.A storm chaser begins the day by checking the Internet for the latest weather reports, and then drives up to l,000 kilometers to where the storm will be and waits for it to develop.

   Although anyone can do it,storm chasing is extremely dangerous.The power of a big storm  can throw a cow into the air or destroy a whole house in seconds.Storm chasers are also often hurt in accidents caused by driving in a heavy rain.If you are a beginner, it is much safer to join a group for storm - chasing vacations during the storm season.

   Even then,storm chasing is not all adventure and excitement.“Storm chasing is 95%driving,”says Daniel Lynch,who spends most of his summer storm-chasing.“Sometimes you

Can sit around for hours waiting for something to happen,and all you get is blue sky and a few light showers.”

   However,for storm chasers,it is all worth it. “When you get close to a storm,it is the most exciting sight you will ever see in your life,”says Jasper Morley.“Every storm is an example of the power of nature.It is the greatest show on Earth.”

小题1:For storm chasing,the first thing storm chasers do is to    .

A.head straight for the center of the storm 

B.get into the car for safety

C.wait patiently for the storm to develop

D.collect information about a coming storm小题2:Beginners of storm chasing are advised    

  

A.not to drive in a heavy rain 

B.to do it in an organized way

 

C.not to get too close to a storm

D.to spend more time on it in summer小题3:By saying “it is all worth it” in the last paragraph,the author means that   

A.storm chasing costs a lot of money

B.storm chasing is worth hours of waiting

C.storm chasing is worth hours of waiting

D.a storm presents the greatest show on Earth小题4:What can we learn from the text?

A.Sometimes storm chasers get nothing but disappointment.

B.Many storm chasers get killed in the storms.

C.Storm chasing is becoming popular around the world.

D.Storm chasing is only fit for young people

题型:填空题

缺陷病毒本质上是指()

A.基因组缺陷

B.复制周期不全

C.病毒酶缺陷

D.包膜刺突缺陷

E.衣壳缺陷

题型:填空题

已知x,y为正整数,且11<x<y<17,问:x,y的值分别为多少
(1)x和y均为奇数
(2)x和y均为偶数

A.条件(1)充分,但条件(2)不充分.

B.条件(2)充分,但条件(1)不充分.

C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.

D.条件(1)充分,条件(2)也充分.

E.(E) 条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.

题型:填空题

RESET键的功能是什么()

A.用于重新启动系统

B.用于取消先前的选择

C.用于取消所有亮的呼叫灯

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