货叉由于使用磨损，货叉水平段和垂直的厚度不得小于原值的()%及以下。
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The young man offered to take the old woman to the railway station.
Weighing seven hundred pounds, ____.
A. she could not move the piano
B. the piano should not be moved
C. the piano was unable to move
D. the piano was too heavy for her move
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