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 （）.

高度超过（）的坝属于高坝。

当坝的高度高于（）m时为高坝。

重力坝按坝体高度分为高坝、中坝和低坝，其中高坝的高度大于（）m。

按规范规定：土石坝中的“高坝”指的坝顶高度在（）的土坝。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

山西大学改为国立后，工学院存在哪些系？（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。