题目内容
在彩电高压到彩管高压嘴的连接线上套一个支撑环式为了()。
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彩色电视机的场扫描电路中场的负载是()。
用BT-3型扫描仪测量一网络，当扫频信号“输出衰减”为0dB时，网络输出的曲线在屏幕上显示为6格，若检波探头直接格扫频输出短接“输出衰减”为12dB时，屏幕上的电压线是6格，则网络的()。
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遥控彩色电视机亮度调节是受()控制的。
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