It is necessary to apply unitary scale of hardness in practice.
实际应用中使用统一的硬度标度是必要的。
The hardness of all metals samples can be continuously established with the same scale by Vickers hardness test. But the test methods are inefficient.
只有维氏硬度试验可以使所有金属建立起连续一致的维氏硬度标度，但原试验手段效率低。
The performance of synergistic scale inhibition was investigated in different water temperature, magnetic field intensity, water hardness and concentration.
研究了不同温度、磁场强度、水质硬度及加药量下的协同阻垢性能。
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