Floors aboard ship are（）.

A . signaling that all personnel are clear before lifting or lowering material B . Examining material for sharp edges or protruding points before handling C . Closing, tagging, or securing valves that permit entrance of steam, water, or air into a fitting or other equipment D . Throwing materials from high places to the deck

A . two rockets，one of which shall be the buoyant type B . three rockets，one of which shall be the buoyant type C . four rockets，two of which shall be the buoyant type D . five rockets，two of which shall be the buoyant type

A . the single hook at the top of the raft B . two lines passed under the raft C . the towing bridle D . All of the above

A . electromagnetic field, revolving armature type B . electromagnetic field, oscillatory armature type C . armature, oscillatory electromagnet field type D . armature, rotating electromagnetic field type

A . station bill B . clearance papers C . certificate of inspection D . permit to proceed

A . Phosphorous B . Safety C . Self-extinguishing D . Woode

A . temperature rise B . input kilowatts C . horsepower D . operating voltage

A . towing bridle B . main weather cover C . external lifelines D . righting stra

A . More than six short blasts and one long blast on the whistle B . Continuous blast of the ships whistle for a period of not less than 10 seconds supplemented by the same signal on the general alarm C . Three short blasts of the whistle supplemented by the same signal on the general alarm D . More than six short blasts and one long blast on the whistle supplemented by the same signal on the general alarm

A . 正确 B . 错误

A . floors B . intercostals C . girders D . stringer

A . portable growler B . galvanometer C . visual inspection D . megohmmeter

A . floors B . intercostals C . girders D . stringer

A . the designated medic aboard B . the shore based superintendent C . a medical doctor D . the approved company medical manual

A . as a connecting strap between the butted ends of plating B . to stiffen areas under points of great stress between beams C . to prevent the anchor from fouling when the brake is released D . to provide an extra heavy fitting in a lift cargo released

A . lower personnel down by a transfer basket B . lower food and water to personnel in a life raft C . lower the life raft down with its full complement D . move equipment around the deck

A . muster list B . certificate of inspection C . clearance papers D . permit to proceed

A . frames to which the tank top and bottom shell are fastened on a double bottomed ship B . transverse members of the ships frame which support the decks C . longitudinal beams in the extreme bottom of a ship from which the ships ribs start D . longitudinal angle bars fastened to a surface for strength

A . Soda acid B . Carbon dioxide C . Dry chemical D . Cartridge-operated Foam

A . boss plates B . buckler plates C . stiffeners D . breast hook

A . LCG B . transverse moment C . righting moment D . inclining moment

A . face plates B . bottom longitudinals C . longitudinal deck beams D . transverse deck beam

Sufficient buoyancy （浮力）to support the wearer should be retained by the life preserver after 48 hours in the water, and it should be reliable even after long period of storage.Thus it should be made of materials resistant to sunlight, gasoline, and oils, and it should be not easily set on fire.The position in which the life preserver will support a person who jumps or falls into the water is most important, as is its tendency to turn the wearer in the water from a face-down position to an upright or slightly backward position, with his face clear of the water, even when the wearer is exhausted or unconscious. The method of adjustment to the body should be simple, and self-evident to uninitiated persons even in the dark under the confused conditions, which follow a disaster.Thus, the life preserver should be reversible that it is nearly impossible to get it on wrong.Catches, straps, and ties should be kept to a minimum.In addition, the life preserver must be adjustable to the wide variety of shapes and sizes of wearers, since this greatly affects the position of floating and the self-righting qualities.A suitable life preserver should also be comfortable to wear at all times, in and out of the water, not so heavy as to encourage to take it off on shipboard while the ship is in danger, nor so burdensome that it hinders a person in the water while trying to swim. 1.The passage is mainly about（）. A.the uses of life preservers B.the design of life preservers C.the materials for life preservers D.the buoyancy of life preservers 2.According to the passage, a life preserver should be first of all （）. A.adjustableB.comfortableC.self-evidentD.self-righting 3.United States Coast Guard does NOT require the life preserver to be made （）. A.with as few strings as possible B.capable of being worn on both sides C.according to each wearer's size D.comfortable and light to wear 4.By “the uninitiated individual” （Para）1, Line.4.the author refers to the person （）. A.who has not been instructed how to use a life preserver B.who has a little experience in using a life preserver C.who uses a life preserver without permission D.who becomes nervous before a disaster 5.What would happen if a person were supported by the life preserver in a wrong position？ A.The waves would move him backwards. B.The water would choke him. C.He would immediately sink to the bottom. D.He would be exhausted or unconscious.