Government Procurement Act Article 19

An entity shall apply open tendering procedures to all procurement of a value reaching the threshold for publication, except otherwise provided for in Articles 20 and 22 hereof.
中文原文 政府採購法第19條
機關辦理公告金額以上之採購,除依第二十條及第二十二條辦理者外,應公開招標。

English translation for reference only; the Chinese text prevails. Not legal advice.