简述绿色贸易壁垒的定义、特性和主要制度安排，并说明我国应当如何应对绿色贸易壁垒。
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两个APS故障，某站或下一站清客。清客后，若主风缸压力﹥（），则列车可不停站运行2个区间（尽量少制动，不用大制动），具体视现场情况而定。由OCC组织运营，司机加强瞭望，密切关注风压变化。
A. 6bar
B. 6.5bar
C. 7bar
D. 7.5bar
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。
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
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