All marks within the IALA system are distinguished by .①material （材料）②top mark ③light characteristics ©color A.①② B.③④ C.②③④ D.①②③④

单选题

All marks within the IALA system are distinguished by .①material （材料）②top mark ③light characteristics ©colorA.①② B.③④ C.②③④ D.①②③④

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单选题

All flow control devices within the system, such as check valves, fuel pumps, accumulators, and relays should be included.

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问答题

inctive equipment lies in the fact that instincts as such are inadequate to adjust either the individual or the group to contemporary conditions.They were developed in the process of evolution as useful methods for enabling the human animal to cope with a radically different and incomparably simpler environment.While the problems and processes of his life and environment have grown more complex,mans inborn equipment for controlling the world he lives in has,through the long history of civilizat

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单选题

The International Association of Lighthouse Authorities (IALA) buoyage system “A” uses some marks to distinguish safe navigation. Which types does not belong to the system?A. lateral marks and cardinal marks B. safe water marksC. isolated danger marks and special marks D. dangerous water marks

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单选题

_____are to be carried out on all ships instead of the second or third annual survey within 3 months, before or after either one of the anniversary date, after completion, commissioning or special survey, as appropriate.

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