吸附薄层色谱常用的吸附剂是十八烷基硅烷键合硅胶。

以硅胶为吸附剂进行薄层色谱分离生物碱时，常用的处理方法是（）

吸附薄层色谱法的常用固定相有（ ）。

用薄层色谱法分离氨基酸类化合物，作为固定相的硅胶其吸附活性不宜太高。

薄层色谱中，硅胶是常用的（）

实验室中常用干燥剂变色硅胶呈现（）后，表明变色硅胶已失效。

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。