Rivets are usually made of（）.

单项选择题Repairing damage to the hull at or above the waterline reduces the threat of（）.

A.free surface effects
B.capsizing
C.continued progressive flooding
D.wind heel

单项选择题Repair of structures on a ship in the vicinity of liquid mud handling areas presents what possible hazard?（）

A.Toxic gasses may be present
B.Flammable gasses may be present
C.Liquid muds may flood adjoining spaces
D.An oxygen-deficient atmosphere may be present

单项选择题Records which must be retained on board after report of casualty to a vessel include the（）.

A.tour reports
B.hull reports
C.machinery repair record book
D.deck equipment log

单项选择题Puncture leaks in the lower tubes or bottom of an inflatable liferaft should FIRST be stopped by using（）.

A.sealing clamps
B.repair tape
C.a tube patch
D.sail twine and vulcanizing kit

单项选择题Point out which one of the following items is not in the charge of Chief Officer in repairing operation（）.

A.hull cleaning
B.derusting and painting
C.the maintenance of boiler
D.docking and undocking