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Урсгал диаграмм нь нэг буюу хэд хэдэн процессоос бүрдэх бөгөөд эдгээр алхам бүрийг өөр тэмдгээр илэрхийлэх ёстой; гэхдээ симбологи нь түгээмэл хэрэглэгддэг тул хүмүүс сонгодоггүй. Энэ бол Америкийн үндэсний стандартын хүрээлэнгээс 1960 онд байгуулагдсан, 1970 онд Олон Улсын Стандартчиллын Байгууллагаас баталсан …
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