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關注：1
2013-05-23 12:21
求翻譯：Quarrying - The cost of drilling and blasting constitutes a large part of the unit price of rockfill. Quartzite for example has excellent qualities for rockfill but is extremely expensive to drill.是什么意思？ 待解決
 懸賞分：1
- 離問題結束還有
Quarrying - The cost of drilling and blasting constitutes a large part of the unit price of rockfill. Quartzite for example has excellent qualities for rockfill but is extremely expensive to drill.
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