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				           		静止代码是为传输测试口的而使用的一种数字信号。
						        					            	 Quiet code is a digital signal used for transmission test purpose.
								    										 
								    				            	 youdao 
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				           		数字信号的传输是数据通信的关键。
						        					            	 The key of data communication is transmission of digital signal.
								    										 
								    				            	 youdao 
- 
				           		数字信号的传输是数据通信的关键。
						        					            	 The key of data communication is transmission of digital signal.
								    										 
								    				            	 youdao