题目内容

Why does Ana choose to do computer design?

A. She is interested in designing computer games.
B. She"s taught herself a lot of programming.
C. She"d like to produce educational software.
D. She benefits less from a foundation level course.

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According to Paragraph 6, what error had Ames made at first?

A. He thought only man-made chemicals dangerous.
B. He suspected his experiments and tests.
C. He is sometimes naive and ignorant.
D. He considered most natural substances negative.

The word barbarians in Paragraph 9 is closest in meaning to______.

A. impolite people
B. wild animals
C. wasteland
D. uncivilized people

题图所示RLC串联的正弦电路,当ω=5000rad/s时发生谐振,已知R=5Ω,L=100mH,端口总电压有效值U=10mV。求Q和通带宽度BW值及电路所标变量的有效值。

题图所示交流电路,当ω=1000rad/s时发生谐振,已知端口总电压有效值U=180V。求电容C值及端口电流有效值I。

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