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【简答题】
How many mice were compared in Spindler's experiment in one group？
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皮皮学刷刷变学霸
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【单选题】已知升余弦滚降系统的滚降系数为 α ,则下列说法错误的是 。
A.
滚降系数越大，则系统频带利用率越低。
B.
系统带宽为采用理想低通特性时的 α 倍。
C.
滚降系数越大，则系统时域响应特性收敛越快。
D.
系统带宽为采用理想低通特性时的1+ α 倍
【单选题】已知升余弦滚降系统的滚降系数为α，则下列说法错误的是 。
A.
系统带宽为采用理想低通特性时的 倍。
B.
滚降系数越大，则系统时域响应特性收敛越快。
C.
系统带宽为采用理想低通特性时的 α 倍。
D.
滚降系数越大，则系统 频带利用率越低。
【单选题】Which of the following cannot replace "substantial" in the sentence? A substantial number of employees are the post-90s generation.
A.
plenty
B.
vast
C.
considerable
D.
tremendous
【单选题】Chinese athletes did a great job in the Winter Olympics in Canada. It can encourage post－90s(90后) . [ ]
A.
work harder
B.
worked harder
C.
working harder
D.
to work harder
【单选题】The post--80s and 90s are ________, so it’s hardly surprising that boys have a close relationship with their parents.
A.
said to be grow up in a greenhouse
B.
said to have grown up in a greenhouse
C.
saying to grow up in a greenhouse
D.
saying to have grown up in a greenhouse
【简答题】The post- 90s generation or the Jiǔ líng hòu is a generation in China, especially in areas, born between 1990~2000, although the post- 95s generation is generally also viewed as a specific gener...
【单选题】17 某放大电路在负载开路时的输出电压为 4V ,接入 12kΩ 的负载电阻后,输出电压降为 3V ,则放大电路的输出电阻为 _______ 。
A.
10kΩ
B.
4kΩ
C.
3kΩ
D.
2kΩ
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