（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

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。

于钻孔灌注桩，在钻孔施工时有哪些一般要求？

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

钻孔灌注桩适用于（）土层。

振动沉管灌注桩适用于（　　）等土层。

混凝土灌注桩施工中，（　　）适用于各种土层。