从本质上阐述红外吸收光谱法比紫外吸收光谱法更有利于有机化合物的定性分析的原因。

何谓红外吸收光谱法？简述红外吸收光谱产生的条件。

采用动物胶称量法测定硅含量时，应选用（）分解试样。

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。

用原子吸收光谱法测定钙时，加入1％的钾盐溶液，其作用是（）。

用原子吸收光谱法测定铷含量时，加入1%钠盐溶液，其作用是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。