Through the seismic wave exploration by us in A2 and A3 working faces, the conditions, velocity, frequency and penetrating distance of seismic wave in the main mining seams are understood preliminary.

通过在A 2、A 3两个面的槽波探测工作，初步了解了其主采煤层的槽波条件、波速、频率和槽波穿透距离。

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Preliminary test and study showed that phased array ultrasonic system was better in signal-to-noise ratio, more sensitive to defects, wider in testing range and higher in working efficiency...

初步试验和研究表明，相控阵超声无损检测系统比传统单探头超声无损检测具有信噪比高、缺陷分辨力强、有效探伤范围宽以及工作效率高等特点。

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While working in the preliminary stage, the designer will also have to consider that many of the golfers will not be able to execute the preferred shot to a particular green.

在初期工作的时候，设计师也要考虑到多数球手没法对一个特殊的果岭使用其喜欢的打法。

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Initially, there were quite a few businesses that expressed an interest in the defined contribution concept, and after working with them in the preliminary stages, 11 were identified that both met the qualifications to participate and were willing and able to fully partner in the development of a working technology.

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While they were working on their story, a preliminary investigation was started.

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The two companies are currently working to resolve this dispute with negotiators and a preliminary agreement reportedly has been reached.

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