（）, 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.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

SHA是一种双向hash算法，类似MD5但功能要比MD5更强大。

简述MD5算法？

MD5是一种加密算法。

MD5算法的HASH值长度为（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

MD5算法的输入是最大长度小于（）bit的消息，输出为（）bit的消息摘要。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。