单项选择题
A.outboard strake of plating on each side of an innerbottom
B.outer strake of plating on each side of the main deck of a vessel
C.plate which sits atop the center vertical keel
D.uppermost continuous strake of plating on the shell of a vessel
单项选择题 The main advantage and chief characteristic of a Steulchen boom is that it can be（）.
单项选择题 The lifeboats on your vessel are stowed on cradles on deck and are handled by sheath-screw boom davits. Which of the following statements about launching a boat is TRUE?（）
单项选择题 The International Load Line Certificate is a document indicating the（）of the various load lines of the vessel.