题目内容

______ with pumps, drains, and wells may cost more than the dam itself.

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What can be inferred from the last sentence of the passage?

拆除爆破中,炮泥一定要填至和孔口平齐。()

含水炸药包括乳化炸药、粉状乳化炸药、浆状炸药、水胶炸药和胶质炸药。()

函数f(x)=3x2+2*cos(pi*x)在x=1处的导数为6+2pi。()

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