土壤管理方法中，免耕法有哪些优缺点？

团粒结构的优缺点及创造良好土壤结构的主要生产措施？

简述土壤系统分类的优缺点。

土壤发生分类存在什么优缺点？

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

简述客观性试题的优缺点。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。