走向长壁采煤法的特点与适用条件是什么？

倾斜长壁采煤法的特点与适用条件是什么？

厚煤层分层开采的方法分为：倾斜分层采煤法、水平分层采煤法和斜切分层采煤法。

倾斜长壁采煤法在地质条件适宜的煤层中，有如下的优点：（）。

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。

采煤工作面沿走向推进，这种采煤法为（）长壁采煤法。