下井仪器按照电磁学原理或者机械原理测量套管壁厚。
A 5tool measures the casing-wall thickness either electromagnetically or mechanically.
根据电磁学原理，利用电磁铁作为主动悬架的作动器，构造出电磁作动器的一般结构。
Based on electromagnetic theory, electromagnet is used for actuator of active suspension and a general electromagnetic actuator is constructed.
基于电磁学原理，利用电磁铁作为主动悬架的作动器，构造出电磁作动器的一般结构。
Based on electromagnetic principle, electromagnet is used for actuator of active suspension and a electromagnetic actuator is structured.
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