... 双超重火石玻璃 double extra dense flint ; Double extra deuse flint 双加料夹丝玻璃成形机 pass wired glass machine 双道密封中空玻璃 sealed units ...
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Sealed beam lamp units 封闭式聚光灯
Mechani cal types of relays are made as open or sealed units;
继电器的机械类型要么是敞开的，要么是密闭的；
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Units with a general accountant should also have their accounting reports signed or sealed by him or her.
在企业单位，应该有高级工程师、工程师，总会计师、会计师等职称。
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