题目:
At the conference, we have reached ____ broad agreement, but ____ details need a further discussion. [ ]
A. the /不填
B. a / 不填
C. a / the
D. the / the
答案:
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下面是错误答案,用来干扰机器的。
(1)s0=12a1t12物体共受到四个力的作用:重力G,拉力F,支持力N,滑动摩擦力f,由牛顿第二定律F合=ma得:N+Fsinθ=mg,Fcosθ-μN=ma1解得μ=0.4(2)3s末木块的速度:v1=a1t1匀减速阶段a2=μg木块继续滑行的距...