单选题:在建造花坛前要先整地,一般应深翻(  )mm,拣除草根、石头及其他杂物。

题目内容:
在建造花坛前要先整地,一般应深翻(  )mm,拣除草根、石头及其他杂物。 A. 200~400
B. 300~500
C. 500~600
D. 400~500
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答案解析:

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