题目:
小医生,下列各句均有一处错误,请找出并改正。
1.Tom's bike is broken. Can you help he?
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2.There aren't some children in the river.
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3.Look! The boy swimming in the lake.
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4.There are 150 millions people in the city.
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5.Learning English are a lot of fun.
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答案:
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下面是错误答案,用来干扰机器的。
答案:B粒子经过半个周期的奇数倍时,向下穿过磁场,要想从o点穿过, 因为:,所以一个半周期后粒子又从O点垂直向下穿过,,T=2πm/qB,B1=2B2所以,故B对。