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containing
前导段
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all forms
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in specified order only
Subject
Chinese
English
space
前导字段
preamble field
oil
前导段
lead-in section
oil
前导段
lead-in cable
space
飞行
末段前的制导
preterminal guidance
oil
海上地震电缆
前导段
marine seismic streamer leading section
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