单项选择题

The horizontal flat surfaces where the upper stock joins the rudder are the（）.

A.rudder keys
B.rudder palms
C.lifting flanges
D.shoes of the rudder

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单项选择题
The grip of a joint represents the（）.

A.thickness of the connected members
B.diameter of the head
C.entire length of the rivet
D.diameter of the shank
单项选择题
The fluke angle of an anchor system is the angle between the（）.

A.flukes and the shank
B.shank and the sea bottom
C.mooring line and the sea bottom
D.flukes and the shackle
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