时间计量 meaning in Chinese

time measurement

Time - measuring instruments - photoluminescent deposits - test methods and requirements
时间计量仪表.荧光覆层.试验方法和要求
Definitions of physical quantities for fundamental frequency and time metrology - random instabilities
基本频率和时间计量学用物理量定义.随机不稳定性
Standard definitions of physical quantities for fundamental frequency and time metrology - random instabilities
基频和时间计量学用物理量标准定义.随机不稳定性