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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
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单选题A light used to signal passing intentions must be an（）.A
alternating red and yellow lightB
alternating white and yellow lightC
all-round white or yellow lightD
all-round white light only
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单选题A light used to signal passing intentions must be an （）.A
all-round yellow light onlyB
all-round white light onlyC
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alternating red and yellow light
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单选题A towing light is（）.A
shown below the sternlightB
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displayed at the mastheadD
a yellow light having the same characteristics as the stern light
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