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【简答题】
电压开关型丁(D)类谐振功率放大器如下图(a)所示，已知V CC =20V，U CES =0.5V，R L =50Ω。试求谐振功率放大器直流电源供给功率P D 、输出功率P o 和放大器效率η C 。
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参考答案：
举一反三
【单选题】用于连接和安装左右车轮的（）等部件称为车桥
A.
车轴
B.
差速器
C.
车架
D.
轴承
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【单选题】Monochromic time system focuses on _____________ rather than _____________.
A.
people; time
B.
time; relationship
C.
relationship; time
D.
people; schedule
查看完整题目与答案
【简答题】先填空然后仿造例句造句。 1. There is . . 2. There are . . 3. It's time to . . 4. It's time for . . 5. How many do you have ? ? 6. How many are there ? ?
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【单选题】下列适合制作绿茶的是( )。
A.
龙井长叶
B.
风凰水仙
C.
福鼎大白
D.
英红1号
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【简答题】组词成句。 1. time, is, it, what? 2. does, get, up, she, time, usually, what? 3. volleyball, he, time, what, play, does? 4. plays, she, piano, the, eight, at, a.m.. 5. school, often, at, 6:30, go, I, to.
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【简答题】读下面的句子，选择与之相关的句子。 (     ) 1. Time for dinner. (     ) 2. Time for lunch. (     ) 3. Time for music. (     ) 4. Time for P. E. (     ) 5. Time for breakfast. (     ) 6. Time for English. A. Read and wr...
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【单选题】The policeman got there __________，so the thief was caught．
A.
on time
B.
in time
C.
in the time
D.
on the time
查看完整题目与答案
【单选题】What is the time scale on the x axis?
A.
The chart is talking about past and present time.
B.
The chart is talking about past and future time.
查看完整题目与答案
【单选题】下列经济业务中,符合损失的定义的是( )
A.
处置固定资产产生的净损失
B.
车间设备的维修支出
C.
销售人员小王报销当月的差旅费
D.
企业因汇兑业务产生的损失
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【简答题】句子搭配。 (    )1. Time for lunch. (    )2. Time for music. (    )3. Time for breakfast. (    )4. Time for P. E. (    )5. Time for English. A. Have some chicken. B. Have some bread and milk. C. Sing and d...
查看完整题目与答案
相关题目：
【单选题】用于连接和安装左右车轮的（）等部件称为车桥
A.
车轴
B.
差速器
C.
车架
D.
轴承
查看完整题目与答案
【单选题】Monochromic time system focuses on _____________ rather than _____________.
A.
people; time
B.
time; relationship
C.
relationship; time
D.
people; schedule
查看完整题目与答案
【简答题】先填空然后仿造例句造句。 1. There is . . 2. There are . . 3. It's time to . . 4. It's time for . . 5. How many do you have ? ? 6. How many are there ? ?
查看完整题目与答案
【单选题】下列适合制作绿茶的是( )。
A.
龙井长叶
B.
风凰水仙
C.
福鼎大白
D.
英红1号
查看完整题目与答案
【简答题】组词成句。 1. time, is, it, what? 2. does, get, up, she, time, usually, what? 3. volleyball, he, time, what, play, does? 4. plays, she, piano, the, eight, at, a.m.. 5. school, often, at, 6:30, go, I, to.
查看完整题目与答案
【简答题】读下面的句子，选择与之相关的句子。 (     ) 1. Time for dinner. (     ) 2. Time for lunch. (     ) 3. Time for music. (     ) 4. Time for P. E. (     ) 5. Time for breakfast. (     ) 6. Time for English. A. Read and wr...
查看完整题目与答案
【单选题】The policeman got there __________，so the thief was caught．
A.
on time
B.
in time
C.
in the time
D.
on the time
查看完整题目与答案
【单选题】What is the time scale on the x axis?
A.
The chart is talking about past and present time.
B.
The chart is talking about past and future time.
查看完整题目与答案
【单选题】下列经济业务中,符合损失的定义的是( )
A.
处置固定资产产生的净损失
B.
车间设备的维修支出
C.
销售人员小王报销当月的差旅费
D.
企业因汇兑业务产生的损失
查看完整题目与答案
【简答题】句子搭配。 (    )1. Time for lunch. (    )2. Time for music. (    )3. Time for breakfast. (    )4. Time for P. E. (    )5. Time for English. A. Have some chicken. B. Have some bread and milk. C. Sing and d...
查看完整题目与答案
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