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【单选题】
下列关于玻璃破坏痕迹证明受力方向的说法不正确的是( )。A.
存在碎齿痕迹的一面为非受力面。
B.
放射状裂纹是从非受力面开始，面一侧扩展，所以裂纹未穿透的一侧为受力面。
C.
存在凹贝纹痕迹的一侧为非受力面。
D.
玻璃在外力作用下，有的同时也产生同心圆状裂纹（受力面产生），它所证明受力方向的痕迹特征正好和放射状裂纹所指明方向的痕迹特征相反。
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【简答题】S1:Do you have a controllable or fixed pitch propeller?S2:We have controllable pitch propeller.Q:What kind of propeller does the ship have ?A. Fixed pitch propeller. B. Changeable pitch propeller . C....
【单选题】As the propeller turns，voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency，pitting of the blades，and vibration.These voids are known as _...
A.
Advance
B.
Cavitation
C.
Edging
D.
Slip
【单选题】The pitch of a propeller is a measure of the（）.
A.
angle that the propeller makes with a free stream of water
B.
angle that the propeller makes with the suce of the water
C.
number of feet per revolution the propeller is designed to advance in still water without slip
D.
positive pressure resulting from the difference of the forces on both sides of the moving propeller in still water without slip
【简答题】S1:Do you have a controllable or fixed pitch propeller?S2:We have a controllable pitch propeller.Q:What type of propeller is it?A. It is a right-handed propeller. B. It is a left-handed propeller. C. ...
【简答题】S1:Do you have a variable or fixed pitch propeller?S2:We have a fixed pitch propeller.Q:What type of propeller is it?A. It's the right-handed propeller B. It's a left-handed propeller C. It's a varia...
【单选题】S1: Do you have a controllable or fixed pitch propeller? S2: We have a controllable pitch propeller. Q: What kind of propeller does the ship have?
A.
Fixed pitch propeller
B.
Changeable pitch propeller
C.
Invariable pitch propeller
D.
Inflexible pitch propeller
【简答题】S1:Do you have a controllable or fixed pitch propeller?S2:We have a fixed pitch propeller.Q:What type of propeller is it?A. It is a right-hand propeller. B. It is a left-hand propeller. C. It is a var...
【单选题】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
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