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The basic training in fire prevention and fire fighting should include the theoretical ele

ments which should cover _____.

A.the three elements of fire and explosion

B.lower and upper flammable limits

C.classification of flies and applicable extinguishing agents

D.All of the above

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第1题

Which of the following statements is true concerning the cetane number rating of diesel fuel? .

A.The cetane number is obtained by comparing the fuel with cetane a colorless liquid hydrocarbon

B.The higher the cetane number, the shorter the ignition lag

C.The highest cetane number of fuel is 100

D.All of the above

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第2题

In machinery space, the valves, pipes should be .

A.arranged as close to each other as possible to save space

B.arranged far away from each other for convenient operation

C.be fixed or clamped to avoid vibration

D.kept easy removable as to convenient repairing work

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第3题

When used in conjunction with a turbocharger, the main function of an after-cooler is to ______.

A.increase the density of the cylinder air charge

B.prevent turbocharger overheating

C.liminate the need for a pre-cooler

D.remove moisture from air compressed by the turbocharger

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第4题

______ means the level for which further specific protective security measures shall be maintained for a limited period of time when a security incident is probable or imminent, although it may not be possible to identify the specific target.

A.Security level 1

B.Security level 2

C.Security level 3

D.Highest safety level

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