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 （）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

将单位内部的局域网接入Internet(因特网)所需使用的接入设备是 ______。

将单位内部的局域网接入 Internet（因特网）所需使用的接入设备是（）。

下面关于局域网接入Internet的叙述中，错误的是

若用户通过局域网接入Internet，则（）不是必须的。

通过局域网接入Internet需要的配置为（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。