（）, 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（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

（）are liable to be stoten, pilfered or may damaged due to improper handing or stowage.

双向身份认证是指移动用户与移动通信网络之间相互认证身份。

移动通信设备的网络测试可以通过()实现。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

网络安全是指对信息系统所涉及的通信网络、网络边界、网络区域和网络设备等进行安全保护。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。