Who needs an X-ray certificate?
什么人申請留學相關簽證(學生簽、陪讀簽),需要做X光胸透檢查?
In brief: people who are intending a stay in New Zealand for more than 12 months, or more than 6 months if they are not from a country that has a low incidence of TB.
Details: https://www.immigration.govt.nz/opsmanual/#46507.htm
简单的说,申请在新西兰计划停留超过12个月的申请人,需要做胸部X光胸透检查。孕妇和11岁以下的孩子可以免除X光胸透。

详细规定见以下网址:
中文翻译:http://www.admission.nz/ym/kmslaw/46507
英文网址:https://www.immigration.govt.nz/opsmanual/#46507.htm

(请注意A4.25.1.e,排除了来自中国的学生签证申请者可以免除X光胸透)
More...