單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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