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问题 多项选择题

以下各项有关功率因数及其意义正确的是（）。

A、功率因数是有功功率与视在功率的比值。

B、在总功率不变的条件下，功率因数越大，则电源供给的无功功率越大。

C、提高功率因数，可以充分利用输电与发电设备。

D、在总功率不变的条件下，功率因数越大，则电源供给的有功功率越大。

答案

参考答案：A, C, D

选择题

下表呈现的是部分元素的原子结构示意图、主要化合价等信息：

下列叙述错误的是

A．氮元素形成的氧化物只有N20，一种

B．镁元素的原子结构示意图中第二层上x：8

C．同一周期中，从左向右，原子的最外层电子数逐渐增多

D．表中元素的最高正化合价数等于原子的最外层电子数
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完形填空

There was a blind girl who hated herself because she was blind. In fact, she 16  everyone, except her loving boyfriend who was  17 there for her. She used to tell her boyfriend, “If I could only see the   18  , I would marry you.”

One day, someone donated (捐赠) a pair of   19   to her. When the bandages came off, she was able to see everything,   20   her boyfriend for the first time. He asked her, “   21    you can see the world, will you  22   me?” The girl looked at her boyfriend and saw that he was  23 . The sight of his closed eyelids shocked her. She hadn’t  24  that. The thought of looking at them for the rest of her life led her to   25  to marry him.

Her boyfriend left   26  and a few days later wrote a note to her,   27 : “Take good care of your eyes, my dear, for   28  they are yours, they were mine.”

This is how the human brain often  29  when our status (地位) changes. Only a very few remember what   30  was like before. Life is a gift. Today before you say a(n)   31  word, think of someone who can’t speak. Before you complain about the   32   of your food, think of someone who has 33  to eat. Before you complain about life, think of someone who went to heaven too early. Before you complain about your old house, think of the people who are   34   in the streets. And when you are tired and complain about your job, think of the   35 . So enjoy what you have and don’t forget your past.

小题1:

A．liked

B．respected

C．disliked

D．thanked小题2:

A．always

B．sometimes

C．seldom

D．never小题3:

A．sight

B．world

C．earth

D．people小题4:

A．shoes

B．glasses

C．trousers

D．eyes小题5:

A．including

B．containing

C．wishing

D．joining小题6:

A．Even if

B．Now that

C．As if

D．In case小题7:

A．follow

B．love

C．marry

D．see小题8:

A．ugly

B．sick

C．short

D．blind小题9:

A．expected

B．hoped

C．asked

D．noticed小题10:

A．decide

B．agree

C．refuse

D．hate小题11:

A．in a hurry

B．without delay

C．with doubt

D．in tears小题12:

A．explaining

B．saying

C．replying

D．announcing小题13:

A．before

B．after

C．once

D．since小题14:

A．stops

B．improves

C．stays

D．works小题15:

A．mind

B．happiness

C．position

D．life小题16:

A．important

B．unkind

C．wise

D．ridiculous小题17:

A．taste

B．price

C．nutrition

D．fat小题18:

A．something

B．everything

C．nothing

D．anything 小题19:

A．wandering

B．living

C．walking

D．working小题20:

A．admired

B．interviewed

C．unemployed

D．satisfied
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