下列化合物的IR光谱中出现3个羰基吸收峰的是（　　）。

下列黄酮类化合物，结构中三碳链为开链的是（）

炔烃是分子中含有碳碳三键的开链不饱和烃。

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

区域的（）主要表现在区域之间、区域与非区域之间，存在有机联系和积极互动。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

下列化合物中，不含有高能键的化合物有（　　）。