40.“ ” means a white light placed as nearly as practicable at the stern showing an unbroken light over an arc of the horizon of 135 degrees and so fixed as to show the light 67.5 degrees from right aft on each side of the vessel.
(A)Masthead light
(B)Sidelights
(C)Sternlight
(D)Towing light

原本題目:40.“ ” means a ...