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。

单因素方差分析的备择假设是

单因素方差分析的备择假设是

单因素方差分析中，计算F统计量，其分子与分母的自由度各为（）。

在单因素方差分析中，F统计量分子与分母的自由度分别是（）和（）。

单因素随机区组试验设计的统计分析方法是一种两向分组的方差分析方法。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。