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【单选题】
两级共射极阻容耦合放大电路,若将第二级改成射极跟随器,则第一级的电压放大倍数将( )A.
提高
B.
降低
C.
不变
D.
等于 1
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【简答题】Section B (8 points) Directions: This section is to test your ability to understand short dialogues. There are 2 dialogues in it. After each dialogue, there is a recorded question. The dialogues and ...
【简答题】钢进行扩散退火的目的是为了减少钢锭、铸件或锻坯的____的不均匀性 ,进行再结晶退火的目的是为了消除____作用,便于继续冷加工 。
【单选题】4) Fun Outdoor Activities Club members are all
A.
experienced people.
B.
outdoor activity lovers.
C.
just the beginners.
D.
activity organizers.
【单选题】Sally touched the wall at the end of the swimming pool and heard the cheers.
A.
莎莉的手碰到了游泳池一端的池壁,此时耳边传来人们的欢呼声。
B.
莎莉的手碰到了游泳池底端的池壁,此时耳边传来人们的欢呼声。
C.
莎莉的手推倒了游泳池一端的池壁,此时耳边传来人们的欢呼声。
D.
莎莉的手碰到了游泳池一端的池壁,此时耳边传来人们的鼓掌声。
【单选题】Which one is not the advantage of the outdoor activities?
A.
Outdoor activities are good for our health.
B.
They can relax both our mind and our body.
C.
People easily make friends when they often join outdoor activities.
D.
People may be injured when they often join outdoor activities.
【单选题】Other fathers are watching their sons cope with the demons of today.
A.
diseases
B.
difficulties
C.
poverty
D.
evils
【单选题】He would like to do outdoor activities中do outdoor activities是什么意思?
A.
做室内活动
B.
做户外活动
C.
做活动
D.
/
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