Sacrifices to meet the particular emergency，such as loss of the ship’s tackle through using it for unusual purposes in order to secure her safety in specially difficult circumstances，（）the subject of a general average contribution.

One of the requirements for a general average act is（）....

单项选择题One of the requirements for a general average act is（）.

No jettison of cargo shall be made fair as（）unless such...

单项选择题No jettison of cargo shall be made fair as（）unless such cargo is carried in accordance with the recognized custom of the trade.

No jettison of cargo shall be made fair as（）unless such...

单项选择题No jettison of cargo shall be made fair as（）unless such cargo is carried in accordance withthe recognized custom of the trade.