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对于远距离观察的信号灯,可选用射程较远的( ) 信号灯。

单选题
2021-09-01 23:15
A、蓝光 
B、绿光  
C、黄光 
D、长波红光 
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正确答案
D

试题解析

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对于远距离观察的信号灯,可选用射程较远的( ) 信号灯。
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