If you have made an intimate relationship with a first-class, it's so critical to treat his child and dog like a friend except essential courtesy and etiquette. 如果你已经与某位上流人士结成很密切的关系，那么除了必要的客套和礼仪外，以朋友的态度对待他的孩子和狗是很重要的。
When a new clean AC power supply is designed, it is very necessary to know the relationship between the equivalent induction and the thyristor turn-on angle. 在设计新型交流净化电源时，掌握等效电感和双向晶闸管延迟导通角之间的关系很重要。
