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【单选题】
Your car wants____, so you'd better have it done as possible.A.
repair
B.
repaired
C.
to repair
D.
repairing
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皮皮学刷刷变学霸
举一反三
【判断题】The
British Library, the
national library, is one of the world’s three largest.
A.
正确
B.
错误
【单选题】If the resistor in the emitter leg is not bypassed by a capacitor then the voltage gain of the small signal amplifier will ( ).
A.
increase
B.
decrease
C.
stay the same
D.
increase in some cases and decrease in other cases
【单选题】he input power to a device is 5000 W at 400 V. The output power of the device is 750 W, and the output impedance is 25 Ω. Calculate the voltage gain in decibels.
A.
-4.6556 dB
B.
4.6556 dB
C.
-9.311 dB
D.
9.311 dB
【简答题】An amplifier has a voltage gain of 100 V/V and a current gain of 1000 A/A. The power gain in decibels is dB
【单选题】If the resistor bypass capacitor in the source leg is removed, the voltage gain of the small signal FET amplifier ( ).
A.
will increase
B.
will decrease
C.
will stay the same
D.
may increase in some cases and decrease in other cases
【单选题】The input power to a device is 5000 W at 400 V. The output power of the device is 750 W, and the output impedance is 25 Ω. Calculate the voltage gain in decibels. ( )
A.
-4.6556 dB
B.
4.6556 dB
C.
-9.311 dB
D.
9.311 dB
【单选题】关于企业使命的说法，正确的是（）。
A.
企业使命说明了企业的根本性质和存在理由
B.
企业使命是企业在一定时期内生产经营所预期达到的理想成果
C.
企业愿景等同于企业使命
D.
企业使命回答的是“我是谁”的问题
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