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（）被称为两栖类的时代。

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试述物业管理企业的法律地位。

You are in charge of a towing vessel that operates exclusively on inland waters. You regularly tow barges that provide services (cargo lighters，fuel barges，etc.) to foreign flag vessels in port. What will be accepted as proper credentials for you and your crew? （）

A. No credentials are required since you operate on inland waters only
B. Social Security card
C. State driver's license with photo ID
D. Merchant Mariner's Document

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燃料油期货套期保值头寸建仓有何时间限制？

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坚持“（）”提前做好常见疾病的防御工作。

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