根据经典测量理论对代表测验长度与测验效度关系的公式进行分析和讨论，提出测验效度与长度关系的表达公式。
An analysis of formulas is made based on classical testing theories and a new formula is put forward to explain the relationship between test validity and test length.
在实验装置上对气体引射器计算基本公式进行了实测验证，分析了理论特性曲线的可信度。
Experimental works for verifying the basic calculation equation of gas injector have been conducted on the lab-testing rig.
经实测验证证明，所建立的HAZ硬度计算公式及热模拟haz硬度计算公式是可靠的。
The practical measurement results showed that the formulas established for calculating the hardness of real HAZ and thermal simulated HAZ are reliable.
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