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

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

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

单项选择题

A.swivel
B.lizard
C.spider band
D.gooseneck