在管式空气预热器中，空气在管内流动，烟气则在管外流动。

对于立管式空气预热器，烟气在管外流动，空气在管内流动。

（）是根据选题需要，人为地控制或模拟客观现象，排除各种干扰，在有利的条件下获得事实材料。

空气－乙炔火焰原子吸收光度法测定水中镁时，铝对镁的测定存在严重的化学干扰。

井巷施工辅助系统中，起净化井下空气、降低井下有害气体浓度、排除岩矿粉尘和炮烟，同时把井上的新鲜空气送入井下、把井下污浊空气排除矿井作用的系统是（）。

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。