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列车进路没有开放时，TCC 向股道发送码或检测码（低频值为 Hz），道岔区段发送检测码。

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According to the dictionary named The Random House Dictionary of the English Language, communication is derived from the Latin word communicare which means “to _” or “to _.”

Communication includes nine components, they are: sender/source, , channel, message, , , feedback, noise, .

Western cultures emphasize the _ function of communication;that is ___.

紫外－可见吸收光谱是由于（）产生的

A. 分子价电子能级跃迁
B. 核外电子能级跃迁
C. 核的自旋能级跃迁
D. 分子振转能级的跃迁