ISO 29991 : 2014现行
LANGUAGE LEARNING SERVICES OUTSIDE FORMAL EDUCATION - REQUIREMENTS
出版：International Organization for Standardization
专家解读视频
This International Standard specifies requirements for language learning services outside formal education.
UNI ISO 29991:2019 - Identical
BS ISO 29991 : 2014 - Identical
NBN ISO 29991 : 2016 - Identical
NF ISO 29991 : 2014 - Identical
DIN ISO 29991 E : 2016 - Identical
NEN ISO 29991 : 2014 - Identical
DIN ISO 29991 : 2016 - Identical
