单项选择题
A.middle of the channel
B.starboard side of the channel
C.port side of the channel
D.side of the channel that has the widest turns
单项选择题 （）is not ordinarily applied to passenger or to combination passenger and freight ships.
单项选择题 A vessel shall be deemed to be overtaking when she can see at night（）.
单项选择题 The temperature at which the air is saturated with water vapor and below which condensation of water vapor will occur is referred to as the（）.