Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, 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 （）.

研选题有何重要意义“选题”就是选定一个科学问题来进行研究。科研选题是否得当在研究工作中十分重要，它关系到科研的目标、方法、水平和价值。重要意义：

下列符合选题原则的科研选题是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

科研课题的选题一定要从（）出发。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。