简述虚拟现实技术的特征。

简述虚拟现实技术有哪些特征？

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

进行试题试测的技术手段有（）。

山西大学改为国立后，工学院存在哪些系？（）

以下选项中，不属于虚拟现实技术基本特征的是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。