由于现有的电子水平仪随时间、温度的变化会产生零点漂移，测量前需进行手动调零。
Change of time and temperature will bring zero shift to electronic gradienter nowadays.
随时间变化的温度梯度与金属内部应力区的相互作用会导致超声速产生一种明显的变化。
The interaction of temperature gradient with internal stress profile would result in time-varying velocity shift.
随时间变化的温度梯度与金属内部应力区的相互作用会导致超声速产生一种明显的变化。
The interaction of temperature gradient with internal stress profile would result in time-varying velocity shift.
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