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。

下面哪些做法（）可以有效地克服沟通障碍。

有效沟通的障碍如何克服？

有效沟通的障碍及如何克服？

克服沟通障碍的有效途径包括（）。

克服沟通障碍的一个有效方式是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。