单项选择题 Where do you obtain approved placards containing instructions for the launching and inflation of an approved inflatable liferaft? （）

单项选择题 Where a period is fixed during which freight is to be paid，the Shipowner must（）to deliver the goods throughout the whole of that period if he wishes to claim payment.

单项选择题 Where a charter-party specifies the estimated time of arrival of a vessel at the port of loading，there is（）obligation on the shipowners to sail to there on the date on which when proceeding with all convenient speed it would normally reach the port on or about the estimated date of arrival.