使用Query的一个非常有用的方法是在执行之前将它的一些变量设置为固定值。
A useful technique to use with a Query is to set some of its variables to fixed values prior to execution.
在预测范围（3年）以后，增长率为固定值，所以我们可以对固定增长公式进行调整以计算预测时间段以外的所有自由现金流量价值，并折现到预测时间段以内。
Growth is constant after the horizon (3 years), so we can modify the constant growth formula to find the value of all free cash flows beyond the horizon, discounted back to the horizon.
由构造引起的煤厚变化具有非线性特征和突变性，但在一定的范围内，煤厚分布的数学期望为一个固定值。
The change of coal thickness caused by geological structure is nonlinear and revulsion, but in a certain range, the mathematical expectation of coal thickness distribution is a fixed value.
用有限元方法做泵的强度验算，一般是使用壳单元，泵的厚度为一个固定值。
When the finite element method is used in the pump strength analysis, the shell element is often used, which has the same thickness for the whole pump.
用有限元方法做泵的强度验算，一般是使用壳单元，泵的厚度为一个固定值。
When the finite element method is used in the pump strength analysis, the shell element is often used, which has the same thickness for the whole pump.
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