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

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

出自：海船船员证

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