年代地层单位的界、系、统相当于地质年代单位的（）。

年代地层单位中的下二叠统又可表述为地质年代单位中的（）和（）。

相对地质年代单位是什么？按顺序写出一级主要年代单位的名称及代号.

翻译：With Average or With Particular Average（WA or WPA）（）

地层的接触关系类型及其特征，相对地质年代单位和年代地层单位。

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。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。