【单选题】【消耗次数：1】
现拟建生产规模扩大二倍的建筑预制品厂，其生产规模指数为0.5,估计投资额约需增加（）。
①
1.4倍
②
1.7倍
③
70％
④
40％
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适度规模就是指生产规模的扩大正好使_____ 达到最大。
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温度和压强都升高为原来的二倍；
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温度升高为原来的二倍，压强升高为原来的四倍；
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failure
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grown
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tended
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cultivated
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each
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some
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certain
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any
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in a way
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in that way
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pretends
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involving
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changing
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modern
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