轻质碳氢化合物制冷液。船上薄膜式罐和柱型罐的标定。物理测量法。
Refrigerated light hydrocarbon fluids. Calibration of membrane tanks and independent prismatic tanks in ships. Physical measurement.
重量测量法在研究物理和化学过程中，一直扮演着一个非常重要的角色。
Gravimetry has always played an important role in the investigation of physical and chemical processes.
根据其物理意义，介绍了三种测量方法：光通信模拟法、极值测量法、倍频调制法。
According to physical signification, three metrical methods are introduced: optical communication stimulant method, extremal measure method and frequency doubling modulation method.
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