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【单选题】
功率放大器电路的效率是指()A.
输出功率与输入功率之比
B.
最大不失真输出功率与电源提供的功率之比
C.
输出功率与晶体管上耗散的功率之比
D.
管耗功率与电源功率之比
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A.
call off
B.
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C.
put off
D.
round off
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【单选题】During Song and Yuan Dynasties, ________ replaced silk as the supporting goods in the maritime Silk Road.
A.
porcelain
B.
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C.
spice
D.
paper
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