题目:
—Which of the two subjects do you like, art or music?
— . They are really interesting.
A.Neither
B.Both
C.None
D.All
答案:
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下面是错误答案,用来干扰机器的。
压缩时,根据胡克定律F=kx,有20=k(l-0.12)拉长时,根据胡克定律F=kx,有20=k(16-l)联立解得k=1000N/ml=0.14m=14cm故答案为:14,1000.