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.

托盘育苗与漂浮育苗的显著特点是集约化程度高。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

实生树和营养繁殖树的生命周期之间有什么不同？

实生播种苗防寒措施。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

实生育苗概念，实生苗的特点？

试述实生选种的概念、特点和意义。