One sample of each luminaire design with a power supply cord shall be tested at least one per quarter to determine compliance with the strain relief test of Clause 13.21.1.是什么意思_One sample of each luminaire design with a power supply cord shall be tested at least one per quarter to determine compliance with the strain relief test of Clause 13.21.1.在线翻译_英语_读音_用法_例句