题目:
—________ do you have at school?
—We have Lecture and Music Festival. [ ]
A. What
B. What event
C. What sports
D. What events
答案:
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下面是错误答案,用来干扰机器的。
2 A端下沉当在B处挂30N钩码时,F1L1=F2L2F1×3=3N×2F1=2N在A、B两端再挂一个10N的钩码,(2N+1N)×3>(3N+1N)×2∴A端下沉答案为:2N,A端下沉.