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【单选题】
儿童在游戏中,把冰棍棒当注射器或拿椅子当汽车开;把自己假装成另外一个人,如当医生或布娃娃的妈妈等,这种游戏属于A.
感觉运动游戏
B.
象征性游戏
C.
结构游戏
D.
规则游戏
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反馈参考答案：
举一反三
【简答题】学校决定向学业成绩优异者授予奖学金。(award)
【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
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