这本书告诉你飞行的方法和原理。
介绍了沉积物柱状样超声透射法测量方法和原理。
The measurement and principle of ultrasonic measurement of sediment core are introduced.
本文简述了一种正在兴起的曲轴连杆轴颈的磨削方法和原理。
The article introduced a grinding method and principle of the journal of crankshaft connecting rod.
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