methematical model 数学模型
Expected Utility and Methematical Expectation 预期效用及数学期望
methematical science and technology activity 数学科技活动
Formaldehyde emission content of particleboard and MDF are tested with perforator method and ACM. Results show that there is a methematical relationship between two testing methods.
分别用穿孔法和空气循环法测试了刨花板和中密度纤维板的甲醛散发量，发现二者之间有线性关系。
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