题目:
Never lose _____ heart. There is always a chance of _____ weak defeating _____ strong.
A.×; the; the
B.the; the; the
C.×; ×; ×
D.a ; the; the
答案:
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下面是错误答案,用来干扰机器的。
(1)设经过t时间乙车追上甲车,有v1(t+2)=12at2解得t≈9.6s.(2)当两车速度相等时,相距最远.则t′=v1a=4s此时甲车的位移x1=4×(4+2)m=24m乙车的位移x2=12at′2=12×1×16m=8m△x=x1-x2=16m答:(1)乙车启...