单项选择题

Two types of anchor shackles which are currently available are（）.

A.U-Type and posilok shackles
B.C-Type and wedge shackles
C.D-Type and bow shackles
D.wedge and kenter shackles

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单项选择题

A.bull gear
B.gypsyhead
C.spanner
D.wildcat

单项选择题

A.right the craft in case of capsizing
B.increase area for radar detection
C.act as a sail in case of a power loss
D.steady the craft in heavy seas

单项选择题

A.a tack weld
B.the self-locking characteristics of its taper
C.a cotter pin
D.a lead plug