A.two balls in a vertical line B.a diamond shape where it can best be seen C.a ball on each end of the tow D.no dayshape
A.no fog signal B.one short blast C.one prolonged and three short blasts D.one prolonged，one short，and one prolonged blast
A.special flashing light B.anchor light C.sternlight D.masthead light
A.the starboard side of the channel B.the centerline of the channel C.an obstruction where the preferred channel is to starboard D.special purpose areas
A.immediately stop B.immediately maneuvering C.immediately anchoring D.immediately going astern
A.vessel not under command B.air cushion vessel in the nondisplacement mode C.vessel towing a submerged object D.vessel engaged in diving operations
A.vessel being towed B.fishing vessel engaged in trawling C.vessel at anchor warning of her location D.power-driven pilot vessel on station underway
A.underway but not making way B.making way，not under command C.not under command，not making way D.trolling underway
A.flashes at regular intervals at a frequency of 120 flashes or more per minute B.is yellow in color C.is visible over an arc of the horizon of not less than 180°nor more than 225° D.All of the above
A.the period of darkness exceeds the period of light B.there is only a partial eclipse of the light C.the periods of light and darkness are equal D.the period of light exceeds the period of darkness
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