A light used to signal passing intentions must be an （）.<br>A:all-round yellow light only<br>B:all-round white light only<br>C:all-round blue light only<br>D:alternating red and yellow light

A light used to signal passing intentions must be an （）.
A:all-round yellow light only
B:all-round white light only
C:all-round blue light only
D:alternating red and yellow light

出自：海船船员证

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