✔ 最佳答案
As far as I know, job requirement doesn't requite applicant know how to swim. Below is Cathay Pacific's requirement:
You must have the Right of Abode in Hong Kong;
You must be educated to HKCEE standard or equivalent with a pass in English (Syllabus B);
Proficiency in reading and speaking Mandarin, English and Cantonese is essential;
You must also be able to pass a medical assessment and meet a minimum arm-reach of 208cm.
I think height is more important and I know the height requirement vary by airline.