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二、选择题(将正确答案的序号填入括号中) 1.VCD视盘机装入光盘后激光头有进给动作但物镜没有上下运动,表明()。 (A)聚焦伺服系统有故障 (B)激光头供电故障 (C)光敏二极管组件故障 (D)循迹伺服故障 2.VCD同CD相比主要区别是()。 (A)全部采用数字技术
Second, the multiple-choice questions (the correct answer the serial number filled in brackets) 1.VCD video disk into the disc after the laser head has a feed action but the objective does not move up and down, that (). (A) Focusing servo system defective (B) Laser head power supply failure (C) Photodiode assembly failure (D) Tracking servo failure 2. The main difference between VCD and CD is (). (A) All use digital technology