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Metallurgy
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十字标线
cross hair
十字标线目镜
bifilar eye-piece
标志性统计数字
benchmark statistics
沿Z坐标 zebedassite <-> 镁十字石
Z-beam
英国标准铅字合金
electrotype metal
(锡2.5〜4.0,锑2.5〜3.0,余为铅)
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