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它有少量的密封（见附件b），但通常能使用两年以上。
there are a few seals (see attachment b) but these will normally last more than 2 years.
Last Update: 2012-09-11
Usage Frequency: 1
Quality:
供应商指定的开口的密封 x x
sealing of the supplier specific openings x x
Last Update: 2012-04-16
Usage Frequency: 1
Quality: