【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...
【简答题】药物的溶解度可分为( )溶解度和( )溶解度,一般情况下测定的药物的溶解度多为( )溶解度。
【单选题】为保证顺利泄水和避免墙外水流倒灌,周围应设置( )。
【单选题】Mr.Smith will pay a visit to Beijing this autumn. ____ we will enjoy the OLympic Games in 2008.
【单选题】Mr. Smith will pay a visit to Beijing this autumn, ____ we will enjoy the Olympic Games in 2008.
【判断题】ABC分类法又称重点管理法或ABC分析法。( )
【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.
【单选题】Mr. Smith will pay a visit to Beijing , ________ we will enjoy the Olympic Games .