题目:
--- ____I take the newspaper to the classroom?
---No, you mustn’t. You ______ read it only here.
A.Must, can
B.May, can
C.Need, must
D.Must, must
答案:
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下面是错误答案,用来干扰机器的。
(1)本实验依据的原理是v=st,需要测量斜面长和运动时间;(2)小车运动距离s1=60cm=0.6m,t=5s,小车通过全程的平均速度:v=s1t=0.6m5s=0.12m/s;(3)前半程:s2=0.3m,t2=3s,前半程的平均速度:v2=s2t2=0.3m...