简述电子商务的技术特征和商业特征？

简述电子商务交易安全的基本特征。

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.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

简述电子商务中的安全问题

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

网络营销的企业竞争是一种以（）为焦点的竞争形态.P电子商务师考试模拟试题

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。