请说出CENTAC压缩机状态字段信息？
参考答案：
压缩机状态字段信息是：脱扣，紧急停车，按了远程停车按钮，报警，按了空载键，按了加载键。
补全对话。
1. —What's this?
—It's ________.
2. —Is this a pencil?
—No, it ________. It's a ________.
3. —Is it a ________?
—Yes, it is.
4. —Is it a bag?
—No, it isn't. It's ________.
电视节目的图象信号电视伴音分别采用哪种调制方式？
