更多"Seawater may be used for drinking w"的相关试题:
[单项选择]Seawater may be used for drinking（）.
A. under no conditions
B. at a maximum rate of two ounces per day
C. if gathered during or immediately after a hard rain
D. after mixing with an equal quantity of fresh water
[单项选择]When collecting condensation for drinking water，（）.
A. a sponge used to mop up and store condensation must be kept salt free
B. only condensation on the bottom of the canopy should be collected
C. it should be strained through a finely woven cloth
D. chlorine tablets should be used to make it drinkable
[单项选择]Drinking salt water will （）
A. be safe if mixed with fresh water
B. prevent seasickness
C. promote urine excretion
D. protect against heat cramps
[单项选择]Safe water buoys may show ONLY（）.
A. flashing red lights
B. flashing green lights
C. white lights
D. yellow lights
[单项选择]Water fog from an all-purpose nozzle may be used to（）.
A. fight an electrical fire
B. fight a magnesium fire
C. eliminate smoke from a compartment
D. All of the above
[单项选择]Diesel engine jacket water is used in the distillation process as the （）.
A. coolant for the distillate
B. coolant for the brine cooler
C. means of heating the feedwater
D. primary means of producing a vacuum within the distiller
[单项选择]Excessively warm water leaving condenser may be caused by（）
A. fouled tubes in shell and tube condenser
B. too little or too warm condenser water
C. air or non-condensable gas in system
D. overcharge of refrigerant
[单项选择]Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.
A. cylinder covers
B. lubricating space
C. crosshead
D. exhaust manifold
[单项选择]（） is used for washing and drinking.
A. The ballast system
B. The salt water system
C. The bilge system
D. The domestic system
[单项选择]Water may boil up around the stern of a vessel in a channel due to（）.
A. slack water when upbound
B. shallow water
C. a cross current
D. a head current
[单项选择]When water is used to fight a fire on board a ship，the effect of the weight of the water must be taken into account. How much sea water will increase the weight displacement by one ton?（）
A. 64 cubic feet
B. 35 cubic feet
C. 100 gallons
D. 500 liters
[单项选择]Oil water separators are used to ensure that ships dont discharge oil when pumping out （）.
A. ballast water
B. boiler water
C. bilge water
D. sewage water
[单项选择]Distilled water from an evaporator may be discharged into a potable water tank （）.
A. through a detachable hose connection
B. after passing through an activated charcoal filter
C. after chemical analysis shows it is fit for consumption
D. through a solenoid operated three-way valve
[单项选择]Sea water is not used directly as a coolant because of （）.
A. low specific heat
B. high specific heat
C. corrosive action
D. high viscosity
[单项选择]Those generally used additives for cooling water are either anti-corrosion oils or inorganic（）.
A. gases
B. paints
C. inhibitors
D. detergent
[单项选择]Distilled water is now largely used on board, this may be corrosive (due to presence of dissolves CO2) and （） to the taste.
A. flat
B. slat
C. sweet
D. acid
[单项选择]Sea water is not directly used as a coolant for engines because of its （）.
A. low specific heat
B. corrosive action
C. high expense
D. acid property
