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【单选题】
脉冲调宽式晶体管调压器中,将发电机电压与基准电压的偏差信号转变为相应宽度的脉冲的电路是:().
A.
电压检测比较电路
B.
调整电路
C.
整形放大电路
D.
控制执行电路
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【单选题】外墙墙身当有屋架且室内外有天棚者,其高度算至屋架下弦底面另加 ( )mm
A.
300
B.
350
C.
200
D.
250
【单选题】下面关于Windows操作系统多任务处理的叙述中,错误的是
A.
每个任务通常都对应着屏幕上的一个窗
B.
用户正在输入信息的窗口称为活动窗口,它所对应的任务称为前台任务
C.
前台任务只有1个,后台任务可以有多个
D.
前台任务可以有多个,后台任务只有1
【单选题】Passage Five Roman soldiers in some places built long rows of signal towers. When they had a message to send, the soldiers shouted it from tower to tower. If there were enough towers and enough soldie...
A.
fine weather
B.
high tower
C.
the spelling system
D.
arm movements
【单选题】以下各个操纵面位于机翼前缘的是() 。
A.
缝翼
B.
扰流板
C.
副翼
D.
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【单选题】Passage Five Some people hate everything that is modern. They cannot imagine how anyone can really like modern music they find it hard to accept the new fashions in clothing they think that all modern...
A.
they are aged
B.
they find it hard to accept modern things
C.
they take their standards of perfection from the Greek
D.
they look at things by the standards of the past
【单选题】Directions: There are five reading passages in this part. Each passage is followed by five ques- tions. For each question there are four suggested answers marked A, B, C and D. Choose one best answer ...
A.
not having to go to school
B.
living in the fresh air
C.
going fishing and hunting
D.
not wanting to go home
【单选题】Passage Five Most famous people have some unusual story associated with their names. Casanova, for example, was a legend in his own time. He was the epitome of the gallant adventurer and lover. Howeve...
A.
scientists
B.
personalities
C.
composers
D.
leaders
【单选题】Directions: There are five reading passages in this part. Each passage is followed by five questions. For each question there are four suggested answers marked A, B, C and D. Choose the best answer an...
A.
a new type of virus
B.
type A virus
C.
a sub-group of type B virus
D.
a virus only existing in Asia
【单选题】Directions: There are five reading passages in this part. Each passage is followed by five questions. For each question there are four suggested answers marked A, B, C and D. Choose the best answer an...
A.
An Extensive Collection of Glass Flowers.
B.
The Live Leopold and Rudolph Blaschka.
C.
Flowers Native to the United States.
D.
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【单选题】根据下列材料回答下列各 题。 Passage Five Some years ago industries had more freedom than they have now,and theyDid not need tobe as careful as they must today.TheyDid not need to worry a lot about the safety of th...
A.
conditions in the work place
B.
the freedom of industries in the past
C.
changes in industrial production
D.
the safety and health of workers and customers
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