设定“标准距离”
The top number is the standard distance at which testing is done, twenty feet.
分子代表检测时所采用的标准远距离，20英尺；
Standard signal output, anti-interference ability for long-distance transmission.
标准信号输出，抗干扰能力强，适用于远距离传输。
Standard signal output, anti-interference ability for long-distance transmission.
标准信号输出，抗干扰能力强，适用于远距离传输。
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