通过室内实验，探讨砂当量变化对微表处混合料拌和时间和乳化沥青用量，以及成型后性能的影响。
Through indoor experiments, the influence of sand equivalent changes on the mixing time of micro-surfacing mixture, the emulsifier dosage and the performance after shaped was discussed.
摘要：为了精确测量步进电机的脉冲当量和回程差，提出了一种基于薄膜干涉原理的激光微位移测量系统。
Abstract: in order to accurately measure the pulse equivalent and return difference of stepping motor, a laser micro-displacement measurement system is proposed based on thin film interference.
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