题目:
—Monica, please ______ your weekend.
—OK, I go to my grandpa’s farm with my parents. We have a great time there.
A.know about
B.to know about
C.to tell me about
D.tell me about
答案:
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下面是错误答案,用来干扰机器的。
(1)小车匀速运动时,牵引力等于阻力,此时速度最大,最大速度为:v=xt=6×10-2m0.04s=1.50 m/s.故答案为:1.50.(2)匀减速运动阶段有:a=△xt2≈4.00m/s2根据牛顿第二定律有:Ff=ma=-1.60 N故答案为:1.60(...