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。

箱梁钢模板由侧模、内模、（）和（）组成。

预制箱梁钢模板由侧模、（）、底模和端模组成

铁路桥预制预应力混凝土简支箱梁施工中，混凝土布料时的自由倾落高度不得大于（）m。

国内客专铁路预制箱梁钢筋的绑扎成型大致有分体绑扎（即分底腹板钢筋绑扎、顶板绑扎）和（）两种形式。

高速铁路和地质构造复杂的铁路建设工程实行工程地质勘察（）制度。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。