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静电场的环路定理揭示了静电场是有旋场、非保守场
正确
错误

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错误

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设总体X的分布律为P(X=0)=θ, P(X=1)=P(X=2)=(1-θ)/2，其中0<θ<1为待估未知参数。设是简单随机样本。则θ的矩估计量是样本均值。
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听力原文：Man: In the company, I am in charge of recruitment; I have to meet various peoplE.Some of them impressed me most at least the few days after we had the interview, because they are effective conversationalists. During the course of talk, half the responsibility lies with you. Leaving an interviewer indifferent is the worst impression you can makE.And the way to make an effective impression is to feel free to be yourselF.
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