品类依其在市场上不同的状态和发展态势大约可区分为导入期、（）、成熟期以及衰退期。
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You are approaching another vessel and see that it has the signal flag “O” hoisted．What is your next action（）.
A. Proceed on present course and speed since the vessel is requesting a pilot
B. Attempt to call the vessel on VHF radiotelephone and begin a search because the vessel has a man overboard
C. Attempt to call the vessel on VHF radiotelephone because it is disabled
D. Approach with caution because the vessel is stopped and making no way through the water
任何情况下都不能与顾客发生争执，面对态度不好、无理取闹的顾客，应（），妥善处理。
A. 据理力争
B. 不予理睬
C. 保持冷静
D. 扭送派出所
《职业病防治法》规定，存在职业危害的生产经营单位的作业场所生产布局应符合（）原则
A. 职业卫生
B. 劳动保护
C. 有害作业与无害作业分开
安装刮墨刀时，刮墨刀高出垫刀（）mm左右，同时垫刀高出刀架20mm左右。
A. 3~5
B. 4~5
C. 2~3
D. 5~6
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