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【单选题】
功率放大电路的效率是（）。A.
输入功率与输出功率之比
B.
输出功率与输入功率之比
C.
输出功率与电源消耗功率之比
D.
电源消耗功率与输出功率之比
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举一反三
【单选题】— What were you doing when I rang you yesterday afternoon? — I was occupied ______ the housework and kept my daughter occupied ______ her homework. [ ]
A.
at; doing
B.
at; to do
C.
with; doing
D.
with; to do
【单选题】— I rang you at about nine, but there was no reply. — Oh, that was probably _____I was seeing the doctor.
A.
why
B.
when
C.
what
D.
That
【简答题】烹调方法中，煮的操作要领是什么？
【简答题】( )的作用只是改变传动方向并不能改变传动比。
【简答题】已知某厂商的生产函数为 ,又P L =6元,P K =10元。求: (1)求该生产函数的边际技术替代率。 (2)分析该生产函数的规模报酬情况。 (3) 产量 =100时的最低成本支出和使用的L与K的数量。 (4)成本 =800时的最大产量和使用的L与K的数量。
【单选题】— I rang you at about nine, But there was no reply. — Oh, that was probably ______ I was seeing the doctor. [ ]
A.
why
B.
when
C.
what
D.
that
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