对放大电路进行动态分析,除了微变等效电路法,还有图解法。
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It's about ten or fifteen minutes ______ foot.
A. at
B. on
Their map archives are more ______ than our collection.
A. extensive
B. bigger
The bus route is more interesting because you can see ______.
A. more
B. many
Now the air in the city is ______ worse than it used to be.
A. much
B. more
C. many