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。

“因材施教”、“长善救失”教学原则的基础是儿童身心发展的（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

“长善救失”“教学相长”的教学思想是（）中首先提出的。

“教学相长”“长善救失”的教学思想是（）中首先提出的。

《学记》中"藏息相辅"教学原则强调（）。

《学记》中“藏息相辅”教学原则强调（ ）。