保证合同防范的是承包商违约风险，主要包括投标保证、履约保证和付款保证。
There are three main forms of surety bond: bid bond, performance bond and payment bond.
承包商 要准备许多投标文件。
The contractors bid against each other on (for) the new project.
一个好的承包商必须高度重视投标标价工作。
A good contractor has to pay attention to the offer in a bid.
一个好的承包商必须高度重视投标标价工作。
A good contractor has to pay attention to the offer in a bid.
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