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 （）.

（）are liable to be stoten, pilfered or may damaged due to improper handing or stowage.

韵腹是韵母的（），位置在韵腹（）的是韵头，在韵腹（）的是韵尾。（）一定是韵尾。一个韵母可以没有（），但一定有韵腹。

韵母由韵头、韵腹、韵尾三部分构成。在拼音“liao”中，充当韵腹的是：（）

一个韵母可以没有韵头和韵尾，但一定有韵腹。

每个韵母都必须有韵头、韵腹和韵尾三部分。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。