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航道侧面标
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航道侧面标
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水运交通指示
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fairway side mark
航道侧面标
设在浅滩、礁石、沉船或其他碍航物靠近航道一侧,标示航道的侧面界限;设在水网地区优良航道时,标示岸形、突嘴或不通航的汊港的水上助航标志。指示船舶在航道内航行。
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yttrium-barium-copper oxide superconductor, YBCO superconductor
yttrium ferrite
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