单项选择题
A.The direction of traffic flow
B.The direction of current
C.The direction of monsoon
D.The direction of wind
单项选择题 （）indicates the weight of the vessel and is,therefore,according to a well known principle of physics,equal to the weight of the water it displaces.
单项选择题 The mariner must be the final judge of the reliance he can place on the information given in the Admiralty charts and other publications,since they（）.
单项选择题 A light is（）from Changshanzui,the SE extremity of the island.