随着水泥强度的提高，水泥的环境影响负荷和资源耗竭系数均增大。
Moreover, with the increase of cement strength, the environmental burden and the resource consumption of cement are deteriorated accordingly.
在无泵浦非耗竭近似下，给出了复耦合系数为任意值时稳态四波混频耦合波方程组的解析解。
The analytical solutions for the stead state equations of four wave mixing with an arbitrary complex coupling constant are given without the undepleted pump approximation.
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