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

单项选择题 Measures taken by the Assured or the Underwriters with the object of saving，protecting or recovering the subject-matter insured shall not be considered as（）.

单项选择题 Loss or damage caused by cutting away wreck or parts of the ship which have been previously carried away or are effectively lost by accident shall not be made（）as general average．