电子商务法是通过电子信息进行的，电子信息作为交易的一种形式；同时，电子信息也是电子信息交易的标的物，被称为信息产品。

在线电子交易可分为在线货物销售、电子信息交易和在线服务三类。

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（）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

订单履行是要解决电子商务交易中的（）问题。

电子交易下单与订单履行方式的特点是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。