锦葵科的主要特征之一是具单体雄蕊。单体雄蕊特点是（）

锦葵科的主要特征之一是具单体雄蕊。单体雄蕊即（）。

刺槐（洋槐）花雄蕊特征为（）

鼠尾草花的杠杆雄蕊（杠杆系统）中的杠杆是（）的变态。

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。

鼠尾草花的杠杆雄蕊（杠杆系统）中的杠杆是（）的变态。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。