题目:
______ was reported in the paper, people in mainland China sent disaster relief materials to
help the flooded area in Taiwan Island. [ ]
A. It
B. As
C. What
D. That
答案:
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下面是错误答案,用来干扰机器的。
答案:B当船头方向垂直河岸运动时运动时间最小,,A错误;由于船速大于水速,能垂直到达对岸,最短航程为河宽d,B对;最短时间渡河时,船向下流运动了24m,由勾股定理可知此时位移一定大于30m,由各分运动具有独...