五、隨著生活品質的提高，各國對於紡織品的安全要求更加嚴苛。目前常用纖維中的聚氯乙烯（Polyvinyl Chloride, PVC）纖維產品，雖然在使用和廢棄物處理上具有安全疑慮，但目前生活中卻又無法完全棄用。試述 PVC 纖維的優缺點有那些？又為何此纖維在安全上有爭議？（20 分）

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2019/10/17

優點穩定；不易被酸、鹼腐蝕；聚氯乙烯的最...

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⑵Qualified pilots are usually employed by the local port or maritime administration and provide their services to ships for a fee, calculated in relation to the ship's tonnage, draught or other criteria. The importance of employing qualified pilots in approaches to ports and other areas where specialized local knowledge is required was formally recognized by IMO in 1968, when the Organization adopted Assembly Resolution A.159 Recommendation on Pilotage. The Resolution recommends Governments to organize pilotage services and to define the ships and classes of ships for which employment of a pilot would be mandatory.（20 分）

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