济南发光字在正常作业状态下，其温升应很低。
Under the normal working condition, the temperature rise of Ji'nan luminous words should be very low.
近年来，频频发生的一系列事故也说明了这个问题，大部分事故均发生在正常作业状态下。
In recent years, a series of accidents happened again and again. It also shows this problem. Most accidents happened under the state of the normal task.
轻微的横向、轴向及扭转振动不影响钻井的正常作业，而钻柱的共振状态会对钻井产生严重的影响。
Light lateral and axis and torsion vibrations do not affect the normal work, but the resonance state has severity effect to drill string.
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