15.3 投标保证金应用投标货币并采用以下形式：The tender bond shall be in the tender currency and shall be in the following form:
由一家在中华人民共和国国内或国外信誉好的银行用招标文件提供的格式或招标机构接受的其他格式出具的银行保函、不可撤销的备用信用证，其有效期应超过投标有效期三十(30)天；A bank that enjoys good reputation in or outside the People’s Republic of China issues a letter of guarantee and an irrevocable stand-by letter of credit in the form provided by the tender invitation documents or in a form that is acceptable to Tenderee, the valid period being thirty (30) days more than the valid period of the tender; ()