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(郑州大学2004—2005学年第1学期期末试题)图11-42所示电路中，已知电源电压及电路条件如下： ，R=2Ω，V1、V2表的读数均为40V，求A、V表的读数及电路的品质因数Q。
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【单选题】There are certain ______ when you have to interrupt people who are in the middle of doing something.
A.
chances
B.
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