（）, 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 （）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

反映总体各单位标志值变异程度的指标称为（）。

变异指标是反映同总体中各单位标志值()的综合指标。

平均指标和标志变异指标都是反映现象（）特征的指标，前者反映的是总体各单位变量值分布的（）趋势，而后者反映的则是总体各单位变量值分布的（）趋势。

标志变异指标是反映同质总体的集中趋势。外语学习网