单选题Water fog from an all-purpose nozzle may be used to（）.A fight an electrical fireB fight a magnesium fireC eliminate smoke from a compartmentD All of the above

One advantage of the all-purpose nozzle is that it ______.

A.can fit any size hose

B.converts a stream of water into a fog

C.increases the amount of water reaching the fire

D.can spray two streams of water at the same time

The difference in water spray pattern between the high-velocity tip and low-velocity applicator used with the all-purpose nozzle is due to ______.

A.a difference in water pressure

B.the method of breaking up the water stream

C.the length of the applicator

D.All of the above

29． The writer thinks that people in large cities should __________ ．

A． stop the used water from getting into underground

B． only use the water from the rivers

C． make their used water clean again

D． use as much sea water as possible

The high-velocity fog tip used with the all-purpose fire fighting nozzle should always be ______．

A.Attached by a chain

B.Coated with heavy grease to prevent corrosion

C.Painted red for identity as emergency equipment

D.Stored in the clip at each fire station

A. The procedure may be used for some components to relocate component data to the SYSAUX tablespace from its current tablespace.

B. The procedure may be used for some components to relocate component data from the SYSAUX tablespace to another tablespace.

C. All the components may be moved into SYSAUX tablespace.

D. All the components may be moved from the SYSAUX tablespace.

If a firefighting situation calls for low-velocity fog you would ______．

A.order the engine room to reduce pressure on the fire pump

B.put the lever on an all-purpose fire nozzle all the way forward

C.attach a low-velocity fog applicator with the nozzle shut down

D.put the lever on an all-purpose fire nozzle all the way back

The cooling liquid used for the cylinder may be referred to as _____.

A.jacket water

B.make-up water

C.boiler water

D.flushing water

The number and position of hydrants arranged on board shall be such that _______，one of which shall be from a single length of hose，may reach any part of the ship normally accessible to the passengers or crew while the ship is being navigated．

A.at least two jets of water which shall be from the same length of hose

B.at least two jets of water emanating from the same hydrant

C.at least two jets of water not emanating from the same hydrant

D.at least two jets of water not emanating from the same hydrant，one of which shall be from a single length of hose