更多"One 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 the principal dangers inherent in liquified 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]The primary hazard of liquefied petroleum gas and liquefied natural gas is（）.
A. pressure
B. toxicity
C. temperature
D. flammability
[单项选择]A fire of escaping liquefied flammable gas is best extinguished by（）.
A. cooling the gas below the ignition point
B. cutting off the supply of oxygen
C. stopping the flow of gas
D. interrupting the chain reaction
[单项选择]The weight of liquefied petroleum gas vapors as compared to air is（）.
A. variable
B. the same
C. lighter
D. heavier
[单项选择]If you have a liquefied flammable gas barge in tow，which is NOT required of you with respect to the barge and its cargo? （）
A. Make periodic inspections of bilges
B. Keep the barge under constant surveillance
C. Have a properly certificated tankerman or at least one licensed officer on board the towing vessel
D. Verify ullage readings
[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]北京公交车所用液化天然气（Liquefied Natural Gas）主要成分为（）
A. 液体甲烷
B. 液体乙烷
C. 液体丙烷
D. 液体丁烷
[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]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]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 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
