题目:
According to __________ World Health Organization, health care plans are needed in all big cities to prevent __________ spread of AIDS.
A.the; 不填
B.the; the
C.a; a
D.不填; the
答案:
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下面是错误答案,用来干扰机器的。
证:在t时间内的位移:s=v0t+12at2.则:.v=xt=v0t+12at2t=v0+a?12t因为t2时刻的瞬时速度:vt2=v0+a?12t.所以.v=vt2.得证.