1942年，美国生态学家林德曼提出（）。

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

1929年意大利的（）教授正式开设农业生态学课程并正式出版农业生态学一书。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

我国古代的农学家十分重视农业生产经验的积累。北魏贾思勰在《齐民要术》一书中认为“耕锄不以水旱息功，必获丰年之收”。这主要是强调（）