本文从理论和实践的两个角度，论述了D型湿砂型表面硬度计的设计思想，定型设计方案。
The ideal of the design and finalized programme of the type-D green mold hardness tester are expounded by the theory and the experiments.
本文从理论和实践的两个角度，论述了D型湿砂型表面硬度计的设计思想，定型设计方案。
The ideal of the design and finalized programme of the type-D green mold hardness tester are expounded by the theory and the experiments.
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