在一段时间内，未经过考虑时任何资源的数量都不会改变。
Q=f(L,K) 2、固定投入与变动投入：长期和短期 （1）固定投入(fixed input）：投入量不随产量变化而变化的投入。 （2）变动投入(variable input)：投入量随产量变化而变化的投入。
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这意味着正待解决的系统性风险，比起那些为投资者更为关注的非系统性的、固定投入的风险，对它的解决需要更长的时间。
This means that addressing systemic risk requires a longer timeframe than that associated with the non-systemic, stationary risks to which investors devote most attention.
但今时今日，重工业让现代的老总们胆颤心寒：固定资产、蓝领工人和资金投入都被视作应予规避、外包或是摆脱的风险。
But today heavy industry makes modern bosses shudder: all those assets, the blue-collar workers, the investment, are regarded as risks to be spun off, outsourced or dumped.
房屋、建筑物以外未投入使用的固定资产；
The fixed assets which have not yet been put into use, among which houses and buildings are not included;
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