在土壤的形成过程中，具有明显的粘化过程的土壤是（）。

土壤分为：沙土、壤土、腐殖土、黏土。

土壤腐殖质一般带（）电荷，主要吸附土壤中的（）离子。

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。

有机质的腐殖化过程，即是有机质经分解再合成生成（）的过程

下列哪种肥料元素在土壤中移动性强。（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。