更多"0ne of the principal dangers inhere"的相关试题:
[单项选择]One of the principal dangers inherent in liquefied petroleum gas is（）.
A. as it warms up it becomes heavier than air
B. the way it reacts with sea water
C. the strong odor it produces
D. its low temperature causes frostbite or freezing
[单项选择]0ne of your crew members falls overboard from the starboard side. You should immediateiy（）.
A. apply left rudder
B. throw the crew a life preserver
C. begin backing your engines
D. position your vessel to windward and begin recovery
[单项选择]0ne of the limitations of foam as an extinguishing agent is that foam（）.
A. cannot be made with salt water
B. is heavierthan oil and sinks below its surface
C. is corrosive and to fire fighters
D. conducts electricity
[单项选择]0ne function of a hulwark is to（）.
A. help keep the deck dry
B. prevent stress concentrations on the stringer plate
C. protect against twisting forces exerted on the frame of the vessel
D. reinfo ce th eside stringers
[单项选择]Buoys which mark isolated dangers are painted with alternating（）.
A. red and black bands
B. green and black bands
C. red and white stripes
D. green and white bands
[单项选择]Wrought iron has an inherent resistance to corrosion but is not to be had freely , its place has been taken by the cuprous alloysAccording to the above sentence , which of the following statements is true?（）
A. Wrought iron can resist liquids flow
B. It is difficult to attain the wrought iron
C. Wrought iron should be combined with cuprous alloys
D. The cuprous alloys have mere disadvantages than wrought iron
[单项选择]‘Offset’ is an inherent characteristic of which of the follow types of control modes?（）
A. Tow position
B. Proportional
C. Reset
D. Rate
[单项选择]The principal purpose of magnetic compass adjustment is to（）.
A. reduce the variation as much as possible
B. reduce the deviation as much as possible
C. reduce the magnetic dip as much as possible
D. allow the compass bowl to swing freely on its gimbals
[单项选择]The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）
A. direction of air flow within the cylinder
B. sequence of port opening
C. method of opening exhaust ports
D. volume of air admitted to the cylinder
[单项选择]The principal personnel hazard unique to Halon extinguishers is（）.
A. displacement of oxygen
B. skin irritation
C. inhaling toxic vapors
D. eye irritation
[单项选择]The principal advantage of NAVTEX radio warnings is that（）.
A. they can be used by mariners who do not know Morse code
B. only an ordinary FM radio is necessary to receive these warnings
C. information on a given topic is only broadcast at specified times
D. they cover a broad spectrum of the radio band allowing reception on almost any type of receiver
[单项选择]The principal purpose of adjustment of the magnetic compass is to eliminate（）as far as possible.
A. variation
B. compass error
C. deviation
D. earth's magnetic force
[单项选择]In a general cargo crane, three principal movements are （）； （）； （）.
A. hoisting；luffing；slewing
B. lifting；raising；lowering
C. rotating；raising；handling
D. hosting；lowering；moving
[单项选择]The principal action in changing from transit to survival draft in the event heavy weather threatens is（）.
A. ballasting
B. deballasting
C. disconnecting
D. hanging off
[单项选择]Convection is the principal means （） temperature is equilibrated in liquids and gases.
A. in which
B. on which
C. by which
D. from which
[单项选择]The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to （）.
A. increase the refrigerating effect, by decreasing the amount of flash gas
B. allow the refrigerant to enter the throttling device in a saturated condition
C. increase the refrigerating effect by increasing the amount of flash gas
D. minimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet side
