水泥混凝土是由水泥加水拌和而成的一种建筑材料。

加气混凝土是一种轻质材料，其成分不含有水泥。

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。

粉煤灰加气混凝土是水泥、石灰、粉煤灰在（）养护下生产的墙体材料。

加气混凝土是一种轻质材料，其成分是水泥、砂子、磨细矿渣、粉煤灰等。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

加气混凝土砌块作为一种新型材料可用于高层建筑的承重墙和隔墙。