单选题在使用（）前，应检查其电源、开关、连接电缆、灯具的水密性能和绝缘电阻情况。A航行灯及信号灯B探照灯、运河灯C闪光灯D普通照明灯
单选题
在使用（）前，应检查其电源、开关、连接电缆、灯具的水密性能和绝缘电阻情况。
A
航行灯及信号灯
B
探照灯、运河灯
C
闪光灯
D
普通照明灯
参考解析
解析：
暂无解析
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