Federal regulations give preference to sealed bidding over contracting by negotiation, that is sealed bids over competitive proposals, if.
相对谈判订约方式，联邦法案更偏爱密封投标，密封投标比竞争性建议更具优势如果。
Based on these, protective measures and proposals of revamp for water-sealed tank are put forwards.
针对故障的原因提出了防范措施，并结合实际情况对水封罐的改造提出了建议。
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