测定空气中甲醛时，甲醛与酚试剂反应生成嗪，在（）存在下，嗪与酚试剂的氧化产物反应生成（）色化合物。

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。

下列化合物与Lucas试剂反应最快的是（）

下列化合物与Fehling试剂不反应的是（）

不与生物碱沉淀试剂发生沉淀反应的化合物是

不与生物碱沉淀试剂发生沉淀反应的化合物是（ ）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。