对于以金融机构出具的不可撤销保函或备用信用证作担保的贷款，商业银行应在收妥银行认可的不可撤销保函或备用信用证副本后，才能允许借款人提款。

不可撤销信用证的鲜明特点是（）。

不可撤销信用证的鲜明特点是（）

不可撤销信用证，是指开证后，未经受益人同意，开证行不得单方面修改或撤销信用证。

信用证按是否可以单方面撤销划分，是信用证最基本和最重要的划分原则。

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。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。