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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

局域网一般都采用（）交换技术，也广泛采用（）交换技术，但用（）交换技术。

使以太网从局域网向城域网领域渗透的以太网技术是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

根据计算机网络覆盖地理范围的大小，网络可分为广域网和以太网。

根据计算机网络覆盖地理范围的大小，网络要分为广域网和以太网。