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。

在铁路桥梁施工中，悬臂浇筑法一般适用于（）等

悬臂法施工适用于大跨径的（）、斜拉桥等结构的施工。

悬臂浇筑法施工适用于预应力混凝土悬臂粱、连续梁、刚构、斜拉桥等结构，通常()，每个工序循环约需6～10d。

桥梁上部悬臂施工时，对挂篮有何要求？

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

相比较而言，下列结构形式适用于大跨度的公共建筑的结构形式是（）。