The pitch of a propeller is a measure

The pitch of a propeller is a measure of the（）.

Aangle that the propeller makes with a free stream of water
Bangle that the propeller makes with the surface of the water
Cnumber of feet per revolution the propeller is designed to advance in still water without slip
Dpositive pressure resulting from the difference of the forces on both sides of the moving propeller in still water without sli

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参考解析：

分类：大风浪中航行题库

Pitching is angular motion of the vessel about what axis?（）.ALongitudinalBTransverseCVerticalDCenterline

2、The pitch ratio of a propeller is the

The pitch ratio of a propeller is the mean pitch divided by （）.Athe propeller diameterBthe propeller radiusCthe pitch angleDthe length of helix

3、Compared to a constant pitch propeller

Compared to a constant pitch propeller, a controllable pitch propeller（）.Amore efficiently uses available engine powerBoperates at a lower effici...

4、Grammar is a description of the（）of a

Grammar is a description of the（）of a language and the way in which linguistic units such as words and phrases are combined to produce sentences in the language.

5、Magnetic dip is a measurement of the a

Magnetic dip is a measurement of the angle between the（）.Ageographic pole and the magnetic poleBlubber's line and true northChorizontal and the magnetic line of forceDcompass heading and the magnetic heading

6、（）is a measure of the market value of

（）is a measure of the market value of all goods and services within the boundaries of a nation.AGNPBGDPCFDIDMNC

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