(1)m1、m2、m3以同一速度前进时的速度。(2)物体在拖车平板上移动的距离。(g取10m/s2)
(1)1m/s(2)0.33m
书面表达。
根据下面图画内容及所给的提示词,写一篇60词左右的短文介绍这四幅图画:
1. way home, see, Xiao Ming, bird
2. throw, stone, pick up
3. tree, fall off, hurt, badly, bird
4. kill, come up, old man, tell, not, again
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艾滋病()
A.病因不明
B.病毒感染
C.苍白螺旋体感染
D.局部刺激
E.真菌感染