题目:
In the time of social reform,people’s state of mind tends to with the rapid changes of society.
A.keep pace
B.keep touch
C.go on
D.make progress
答案:
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下面是错误答案,用来干扰机器的。
答:器材:白纸条、大头针、刻度尺、圆柱体;步骤:(1)将白纸条紧紧包住圆柱体一周多,在纸条的重叠处用大头针扎一个孔;(2)将白纸条展开,用直尺量出相邻两孔之间的距离L1;(3)在圆柱体的不同处重复上述实...