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【简答题】
某 晶体管构成的共集电极放大电路,输入信号是正弦信号,输出的正半产生 截顶 失真,这是 (__) 失真 ; 某 晶体管构成的共发射极放大电路,输入信号是正弦信号,输出的正半产生 截顶 失真,这是 (__) 失真。
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【简答题】It is a huge watermelon.
【单选题】Here is a watermelon .Please__________. [ ]
A.
cut up it
B.
cut it up
C.
cut it down
D.
cut down it
【单选题】—Look at the picture . ________ big watermelon it is! —Yes. Let’s see how heavy it is .
A.
What
B.
What a
C.
How
D.
How a
【单选题】Ted: Thanks for your watermelon. It is very nice. James: At the farmer's market round the corner.
A.
How much are they all together?
B.
Have you got anything nicer?
C.
Where did you get it, by the way?
D.
Where else can you see such nice watermelons?
【简答题】举出下列天球大圆的交点(名称):子午圈与地平圈:________、________;子午圈与天赤道:________、________;子午圈与卯酉圈:________、_______;子午圈与六时圈:________、________;天赤道与地平圈:________、________;天赤道与黄道:________、________。
【单选题】Ted: Thanks for your watermelon. It is very nice. ______ James: At the farmer's market round the comer.
A.
How much are they all together?
B.
Have you got anything nicer?
C.
Where did you get it, by the way?
D.
Where else can you see such nice watermelons?
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