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单选题
In general，the most effective period for observing stars and planets occurs during the darker limit of（）.
A
sunset
B
civil twilight
C
nautical twilight
D
astronomical twilight
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单选题When the period of beam seas equals the natural rolling period of a vessel，what will most likely occur?（）A
Excessive pitchingB
Excessive yawingC
Excessive rollingD
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单选题Fire extinguishers on inspected vessels are numbered by size I through V，with I being（）.A
used for electrical fires onlyB
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单选题Portable foam type fire extinguishers are most effective on（）.A
mattress firesB
oil firesC
wood firesD
All of the above
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单选题In observing rig motion while under tow，the period of roll is the time difference between（）.A
zero inclination to full inclination on one sideB
full inclination on one side to full inclination on the other sideC
full inclination on one side to the next full inclination on the same sideD
zero inclination to the next zero inclination
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单选题Which statement about firefighting foam is TRUE?（）A
Foam conducts electricityB
To be most effective，foam should be directed at the base of the fireC
Foam is most effective on burning liquids which are flowingD
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单选题Which of the following represents the emergency signal for fire aboard ship?（）A
More than six short blasts and one long blast on the whistleB
Continuous blast of the ships whistle for a period of not less than 10 seconds supplemented by the same signal on the general alarmC
Three short blasts of the whistle supplemented by the same signal on the general alarmD
More than six short blasts and one long blast on the whistle supplemented by the same signal on the general alarm
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单选题Fire extinguishers used on ship’s are numbered by size I through V，with I being（）.A
used for electrical fires onlyB
the smallestC
the most accessibleD
the most effective
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单选题If you hear a continuous blast of the ship’s whistle for a period of a period of not less than 10 saconds supplemented by a continuous ringing of the general alarm bells for not less than 10 seconds,you should go to your（）.A
boat stationB
fire stationC
man overboard stationD
collision station
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问答题Discuss, and decide together: ● What measures are most effective for identifying new export markets? ● How to maintain sales in export markets?
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单选题In the Romantic period, _____ is the most prosperous literary form.A
proseB
poetryC
fictionD
play
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单选题From the passage we can infer that.A
experiments are more or less significant for researches concernedB
the successful experiments result from perfect scientific meansC
human cases are more effective in observing the brain activityD
the result of scientific research should be set aside for a period of time before it’s applied
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