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。

任何工件加工时都要划分加工阶段。

MRI信号的空间定位，必须具有（）

一个在空间处于自由状态下的刚体具有（）个自由度。

一个刚体在空间运动具有（）自由度。

任何没有约束的刚体在空间具有（）个自由度。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。