According to the regulations for lifeboat falls，which action must be taken with the falls no later than 5-year intervals?（）

单项选择题According to the regulations for life boat falls，which action must be taken at 30-month intervals?（）

A.End-for-ended
B.Renewed
C.Inspected
D.Weight tested

单项选择题A sheave is a（）.

A.grooved wheel in a block
B.line to hold a lifeboat next to the embarkation deck
C.partial load of grain
D.seaman's knife

单项选择题A sea anchor is（）.

A.a heavy anchor with an extra long line used to anchor in deep water
B.a cone shaped bag used to slow down the wind drift effect
C.a padeye to which the sea painter is made fast
D.made of wood if it is of an approved type

单项选择题A person referring to the stern sheets of a lifeboat is speaking of（）.

A.the line attached to the tack of the lugsail
B.the emergency rudder
C.a canvas awning
D.the aftermost seating

单项选择题（）is used for heaving up and slacking away the anchor and chain.

A.A winch
B.A windlass
C.A deck crane
D.A lifeboat engine