To see the invitation to bid on the content of the letter of acceptance and send invitation to bid on the content of the letter of acceptance mail, if there is no reply to the owner to participate in the bidding confirmation of the letter of acceptance of the bid is invalid, or did not reply to the owner to participate in the bidding confirmation of the letter of acceptance of the bid is not eligible to participate in the bidding of the contents of the bidding, the bidder to vote for the bid this standard this standard is invalid.