A ship must have a self-contained breathing apparatus to be used as protection from gas leaking from a refrigeration unit. To meet this requirement，you may use（）.

A . nitrogen B . oxygen C . carbon dioxide D . water vapor

A . a request for assistance B . the location of the unit at the time of the casualty C . an estimate of the cost to repair damages D . the amount of fuel remaining

A . approved oily-water separating equipment B . a fixed or portable containment system at the shore connection C . a spare pump in case the main pump is inoperative D . at least one outlet accessible from the weather deck

A . portable ventilation system B . flame safety lamp C . self-contained breathing apparatus D . gas mask

A . 30 gallons per minute B . 40 gallons per minute C . 50 gallons per minute D . 60 gallons per minute

A . where oil or chemical drums are stored B . in all battery storage locations C . in paint lockers D . in all of the above locatio

A . maximum pressure allowed at that branch B . name of the space or spaces which it serves C . date of the last maintenance inspection D . pressure needed to maintain an effective stream at that point

A . used at the earliest opportunity B . hydrotested C . recharged D . weighed again in one month

A . three months B . six months C . twelve months D . eighteen month

A . Minerals Management Service B . Occupational Safety and Health Administration C . Mine Safety and Health Administration D . American Bureau of Shipping

A . week B . month C . three months D . six month

A . two or more releasing stations B . automatic release in event of a fire C . an audible alarm and time delay D . an audible and visible alarm

A . Nearest Oceanographic office B . The Marine Safety Center at Coast Guard Headquarters C . National Ocean Service D . Nearest Officer in Charge，Marine Inspectio

A . in a locked cabinet in the machinery space B . in an unlocked cabinet in the machinery space C . in a separate and accessible location D . at a fire hydrant locatio

A . conduct a fire drill B . conduct a boat drill C . log the fore and aft draft marks D . test the emergency generator

A . the name of the unit on which it is located B . the date that it was installed on the unit C . the names of the individuals qualified to use it D . an identification number different from other extinguishers on the unit

A . general plans B . builder's documentation C . Certificate of Inspection D . construction portfolio

A . canister-type gas mask B . fresh-air breathing apparatus C . self-contained breathing apparatus D . combustible gas indicator

A . on port side B . on starboard side C . at the port quarter D . at the ster

A . at each alarm bell B . at each alarm actuator C . near all exits D . on the station bill

A . carry at least two injured persons B . float for at least two hours C . be used on the types of helicopters serving the unit D . All of the above

A . shipping jurisdictions for each fulfillment center B . shipping codes for each set of shipping charges to be applied to products C . shipping methods for each carrier and service offered by the carrier D . shipping zones for each geographical region where goods will be shipped

A . the pump discharge B . the manifold connection C . each fire station discharge D . the pump statio

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.