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一般说来,如此超薄得振动膜应该是透明的,可允许激光束穿过。
Normally a diaphragm so thin would be transparent, allowing the laser's light to escape.
必须先做除锈及去氧化膜处理,一般使用化学抛光或电解抛光。
Must do derusting and to oxidation film processing, generally use chemical polishing or electrolytic polishing.
牛皮纸手提袋一般不覆膜,是一种成本最低的手提袋。
Kraft paper bag is generally not covered, is a handbag with lowest cost.
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