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。

滑膜关节的基本结构和辅助结构包括哪些？

滑膜襞和滑膜囊

滑膜关节的基本结构是（）、（）和（）。其辅助结构有（）、（）和（）。关节腔内的压力是（）压。

滑膜关节辅助结构不包括

关节囊、韧带、滑膜等急性损伤所致的疼痛性质的描述可能有( )。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。