选择精基准的原则中讲到的“自为基准”是指（）。

自为基准是以加工面本身为基准,多用于精加工或光整加工工序,这是由于( )。

《孝经》第一章是和最后一章是（）

古代人们结婚的时候，常贴着一幅对联是：“诗歌杜甫其三句，乐奏周南第一章。”请问“周南第一章”是指什么？

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。

《孝经》第一章是和最后一章是（）