石质路堑开挖方式中，（　）有薄层开挖、分层开挖、全断面一次开挖和特高梯段开挖等方式。

当前广泛采用的路堑开挖方法是（　），它包括薄层开挖、分层开挖、全断面一次开挖等方式。

平缓横坡上一般土石路堑宜采用()方法开挖?

可以在（）阶段采用Make-or-buy决策分析。

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

《铁路路基工程施工质量验收标准》对路堑开挖的要求有（）

当路堑过长，弃土运距过长的傍山路堑，其一侧堑壁不厚的路堑开挖时，宜选择的开挖方法是（ ）。

路堑开挖不可采用的爆破方法有（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。