单项选择题
A.the speed of the vessel B.the speed of the propeller C.the wake D.the wake fraction
Wake varies considerably with the form of the vessel, b...
单项选择题Wake varies considerably with the form of the vessel, but, generally speaking, the bluffer the ship （） the wake value.
A.the higher B.the lower C.the faster D.the slower
When viewed from astern, if the propeller revolves in a...
单项选择题When viewed from astern, if the propeller revolves in a clockwise direction when going ahead, it is known as （）.
A.ahead direction B.astern direction C.right-handed D.left-handed
The pitch ratio of a propeller is the mean pitch divide...
单项选择题The pitch ratio of a propeller is the mean pitch divided by （）.
A.the propeller diameter B.the propeller radius C.the pitch angle D.the length of helix
