目前，测定混凝土拌合物和易性的现行方法主要有（）

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.

混凝土试块标准养护龄期为（）d（从搅拌加水开始计时）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

用搅拌运输车在行进中拌制混凝土时，从加水后算起，至全部卸出的时间不宜超过（）分钟。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

混凝土出现蜂窝，原因是混凝土搅拌时间不够，未拌合均匀，和易性差，振捣不密实。

混凝土出现蜂窝，原因是混凝土搅拌时间不够，未拌合均匀，和易性差，振捣不密实。(   )