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According to Paragraph 2, which of the following is NOT true of the perpetual studiers when they are in school？

A. They usually sit in the front of the class and write pages of notes a day.
B. They talk to someone only at the end of class when the lecture is over.
C. They take out all their books and study for the classes that they have the next day.
D. They rarely take part in something of a social lif

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A．Backlighting.B．Flashbulbs.C．Time-lapse photography.D．Soft foc

A. Backlighting.
B. Flashbulbs.
C. Time-lapse photography.
D. Soft focus.

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A．They are active during daylight hoursB．Their heads are exposed to sunlight whil

A. They are active during daylight hours
B. Their heads are exposed to sunlight while they sleep
C. They have only partially adapted to their tropical environment
D. Their wings are easily damaged by ultraviolet radiation

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Look at the four squares [■] that show where the following sentence could be inserted in the passage. One such region is located in the western United States, where recent tectonic and volcanic activity has occurred. Where could the sentence best be added？ Click on a square [■] to insert the sentence in the passage.

A. Square Ａ.
B. Square Ｂ.
C. Square Ｃ.
D. Square Ｄ.

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一RLC串联谐振电路，已知r=10Ω，L=64μH，C=100pF，外加电源电压u_s=1V。求电路谐振频率f₀、品质因数Q、带宽B、谐振时的回路电流I₀和电抗元件上的电压U_L和U_C。

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According to Paragraph 2, which of the following is NOT true of the perpetual studiers when they are in school？

A. They usually sit in the front of the class and write pages of notes a day. B. They talk to someone only at the end of class when the lecture is over. C. They take out all their books and study for the classes that they have the next day. D. They rarely take part in something of a social lif

A．Backlighting.B．Flashbulbs.C．Time-lapse photography.D．Soft foc

A．They are active during daylight hoursB．Their heads are exposed to sunlight whil

一RLC串联谐振电路，已知r=10Ω，L=64μH，C=100pF，外加电源电压us=1V。求电路谐振频率f0、品质因数Q、带宽B、谐振时的回路电流I0和电抗元件上的电压UL和UC。

A. They usually sit in the front of the class and write pages of notes a day.
B. They talk to someone only at the end of class when the lecture is over.
C. They take out all their books and study for the classes that they have the next day.
D. They rarely take part in something of a social lif

一RLC串联谐振电路，已知r=10Ω，L=64μH，C=100pF，外加电源电压u_s=1V。求电路谐振频率f₀、品质因数Q、带宽B、谐振时的回路电流I₀和电抗元件上的电压U_L和U_C。