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RIGHTWARDS OPEN-HEADED ARROW头部为空的向右箭头

LEFT RIGHT OPEN-HEADED ARROW头部为空的左右箭头

open-top bulk-headed internal floating roof敞口隔舱式内浮顶

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Double-headed open-ended engineers wrenches工程用双头呆扳手

Double-headed open-ended engineers' wrenches工程用双头开口扳手