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【判断题】
信号源的调制类型一般有 FM 、 AM 、 PM 。A.
正确
B.
错误
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【单选题】_____ is known to all that the Amber Room belongs to the Russians.
A.
As
B.
which
C.
It
D.
What
【单选题】当晶体三极管要工作在电流放大状态，外部条件应满足( )。
A.
发射结反偏，集电结反偏
B.
发射结反偏，集结正偏
C.
发射结正偏，集电结反偏
D.
发射结正偏，集电结正偏
【单选题】What do we learn about Japan from the passage?
A.
It now belongs to the western hemisphere.
B.
Its economic situation perhaps goes even worse than the US.
C.
Its financial systems collapsed as other western countries did.
D.
Its economy will recover sooner than other Asian countries.
【单选题】Among the following physiological activities, what belongs to conditioned reflex is
A.
cough results from respiratory mucosa stimulation by secretions or foreigns
B.
blinking caused by foreigns touching the cornea
C.
the lower leg extension caused by tap quadrant tendon below the patella
D.
The limbs are painful and retract when hurt by harmful stimulation
E.
saliva secretion caused by smell the fragrance of food
【单选题】______ is known to all，the Amber Room belongs to the Russians.
A.
As
B.
Which
C.
It
D.
What
【单选题】What is the main idea of this passage?
A.
Modem society only belongs to the young.
B.
Modem life has brought new problems to the old.
C.
Today's young people are happier than their parents.
D.
It is necessary to take better care of the old people.
相关题目：
【单选题】_____ is known to all that the Amber Room belongs to the Russians.
A.
As
B.
which
C.
It
D.
What
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