论述批发商、零售商和代理商之间的区别与联系。

产品营销渠道主要包括生产者、批发商、零售商、代理商和（）。

大类商品批发商是指专业化程度高，专门经营某一大类商品商人批发商。

根据（）的不同，批发企业可以分为独立批发商，代理商和制造商的分销机构。

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。

药品批发企业质量管理负责人具有大学以上学历，且必须是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。