EXERCISES y1.本书讨论 CAD/CAM的技术,应用及范围( scope This book describes the technology, applications and scope of CAD/CAM 2.用三角( trigonometry)来描述电信号已证明是很有价值的。 The use of trigonometry to describe an electrical signal has proved very valuable. 3.感抗( inductive reactance)与电阻之比被称为该电路的Q The ratio of inductive reactance to resistance is called the Q of the circuitEXERCISES  1. 本书讨论CAD/CAM的技术，应用及范围（scope). 2. 用三角（trigonometry)来描述电信号已证明是很有价值的。 This book describes the technology, applications and scope of CAD/CAM. The use of trigonometry to describe an electrical signal has proved very valuable. 3. 感抗（inductive reactance)与电阻之比被称为该电路的Q。 The ratio of inductive reactance to resistance is called the Q of the circuit