單項(xiàng)選擇題

A vessel conducting mine clearing operations will show（）.

A.three balls in a vertical line
B.two balls in a vertical line
C.one ball near the foremast and one ball at each fore yard
D.one diamond near the foremast head and one ball at each fore yard

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單項(xiàng)選擇題

A vessel being towed will show（）.

A.a forward masthead light
B.sidelights and a sternlight
C.a towing light
D.All of the above

單項(xiàng)選擇題

A vessel being towed astern shall show at night（）.

A.the lights required for a power-driven vessel underway
B.only the required masthead lights
C.a sternlight only
D.sidelights and a sternlight