One sample of each luminaire design with a lamp-supported lampholder shall be tested at least once per quarter to determine compliance with the strain relief test of Clause 13.21.2.是什么意思_One sample of each luminaire design with a lamp-supported lampholder shall be tested at least once per quarter to determine compliance with the strain relief test of Clause 13.21.2.在线翻译_英语_读音_用法_例句