The major need to check 1: history of the company to bid the job stability or not 2 see the company's subcontractors; 3 compare the costs of materials and labor, expensive or not, 4 call bargain price reductions or how many days from shipping date to the 5, installed a few days completed five assigned tasks such as picking period the value of paying agencies, to install another 40% 40% 20%, after the installation is finished, etc.
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