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 （）.

东汉洛阳城是（）制。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

宋代洛阳城是十分重要的城市，它是北宋的西京城。洛阳城的主体沿用了（）的结构。

我国的“六大古都”分别是北京、南京、西安、洛阳、开封和（）城市？

位于白马寺，今天洛阳市以东15公里处。是我国建都时间最长、建都朝代最多的古代都城遗址之一。它是（）。

周公，姓姬，名旦，西周初期著名政治家、思想家，古代洛阳城的营建者。周公在洛阳定九鼎，并制礼作乐，强化了洛阳在古代中国的政治、文化中心地位。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。