焦炉煤气是无色有臭味有剧毒易燃易爆的气体，CO含量为5--8%。

施工现场的易燃、易爆和剧毒物品在储存时，不得与其他物品混放。

网络认证技术只是单向认证技术

有毒、剧毒、易燃、易爆介质的液位计不用冲洗。

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.

双向身份认证是指移动用户与移动通信网络之间相互认证身份。

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。