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【判断题】
三角形连接的三相异步电动机在满载运行时,若一相电源断路,则首得天先烧坏一。
A.
正确
B.
错误
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【简答题】某单调谐放大器如图例2—3所示,已知f0=465kHz,L=560μH,Q0=100,N12=46圈,N18=162圈,N45=13圈,晶体管3AG31的Y参量如下:gie=1.0mS,goe=110μS,Cie=400pF,Coe=62pF,yfe=28∠340°mS,yre=2.5∠290°μS。 试计算: (1)谐振电压放大倍数|Kv0|; (2)通频带; (3)回路电容C; (4)回路插入...
【单选题】为保证顺利泄水和避免墙外水流倒灌,周围应设置( )。
A.
粗粒料反滤层
B.
细料反滤层
C.
粗料隔离层
D.
细料隔离层
【简答题】ABC 分析法又称排列图法
【简答题】已知某电容器的电容C=0.159μF,接在电源电压U=100V的交流电路中,求f=1000Hz时的无功功率。
【单选题】Mr.Smith will pay a visit to Beijing this autumn. ____ we will enjoy the OLympic Games in 2008.
A.
where
B.
when
C.
which
D.
how
【单选题】Mr. Smith will pay a visit to Beijing this autumn, ____ we will enjoy the Olympic Games in 2008.
A.
where
B.
when
C.
which
D.
that
【判断题】ABC分类法又称重点管理法或ABC分析法。( )
A.
正确
B.
错误
【单选题】Why will Google give investment?
A.
to help small and medium size businesses grow and reduce poverty
B.
to improve public services
C.
to help two climate change programs
D.
All of the above are right
【单选题】Mr. Smith will pay a visit to Beijing this autumn, ________ we will enjoy the Olympic Games in 2008.
A.
where
B.
when
C.
which
D.
how
【单选题】Mr. Smith will pay a visit to Beijing , ________ we will enjoy the Olympic Games .
A.
where
B.
when
C.
which
D.
how
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