单项选择题
A.reduce spud can bearing pressure
B.keep the unit level and reduce overloading
C.reduce stresses on the hull
D.minimize the potential for punch-through
单项选择题 Great Salt Pond on Block Island is（）.
单项选择题 Good seamanship while towing in heavy weather requires all of the following EXCEPT（）.
单项选择题 Given the same water depth and line tension，the holding power of a 19 pound/foot wire rope mooring system in comparison to the holding power of a 90 pound/foot chain mooring system will be（）.