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【单选题】
( )不是串联谐振电路的特征。A.
电容中电流等于电感中的电流
B.
电感、电容上的电压UC=UL=QU(Q为品质因数)
C.
电阻上的电压等于电路中的端电压
D.
谐振时电路阻抗最小,为纯阻性,电流最大
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举一反三
【单选题】A 60.0-kg man stands at one end of a 20.0-kg uniform 10.0-m long board. How far from the man is the center of mass (or center of gravity) of the man-board system? A) 1.25 m B) 2.50 m C) 5.00 m D) 7.50...
A.
B.
C.
D.
D
【单选题】What will the woman do on the day the man leaves?
A.
She will drive the man to the airport.
B.
She will be late for work for 2 hours.
C.
She will arrive at work after 9 a. m.
D.
She will see the man off during work time.
【单选题】新蒸馏出来的白兰地须盛放在橡木桶内使之成熟,并应经过至少 的陈酿,白兰地才会变得芳郁醇厚,并产生其色泽。
A.
10 个月
B.
18个月
C.
20个月
D.
24个月
【简答题】A．It carded the man to a spaceship. B．It left the man in the car. C．It walked with the man alongside the road. D．It fought against the man.
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