土壤侵蚀主要类型有水力侵蚀、重力侵蚀、（）、冻融侵蚀和混合侵蚀等。

土壤侵蚀主要类型有水力侵蚀、（）和混合侵蚀等。

防治土壤侵蚀的关键在于（）侵蚀因子。

一个完整的土壤剖面应包括土壤形成过程中产生的（）和（），即A、B、C层。

土壤侵蚀调查

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

自然土壤剖面层次主要有哪些？

人为农业旱耕地土壤剖面层次主要有哪些？