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【单选题】
过零比较器可将输入正弦波变换为()。A.
三角波
B.
锯齿波
C.
尖顶脉冲波
D.
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【单选题】The boy lets the animals do exercises so that they can ______.
A.
get fitter
B.
play a game together
C.
learn some English words
D.
stop throwing things all around
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【单选题】According to the discussion, what can be concluded about animal language?
A.
Animals do have language.
B.
No conclusion has been made at present.
C.
Animals do not have language.
D.
Some animals have language and others do not.
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【简答题】茶树按照叶片大小可以分为()、()和()。
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