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可变生产要素增加所引起的产量(或收益)的变化可以分为（）等阶段。

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The biggest advantage of this product is that _
[ A]it will be faster and cheaper than manual labor
[ B ] it can climb mountainsides, drill holes , insert bars and cement
[ C]it can collect data on the slope ' s stability
[ D] it can drill without a human being on board

[A]It
[B] As
[C]What
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