操作系统实现“按名存取”的关键在于解决（）。

如果允许不同用户的文件可以具有相同的文件名，通常采用（）来保证按名存取的安全。

如果允许不同用户的文件可以具有相同的文件名，通常采用哪种形式来保证按名存取的安全?

实现按名存取后，允许用户对记录式文件进行存取的最小单位是（ ）。

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。

对记录式文件，操作系统为用户存取文件信息的最小单位是

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。