光照强弱不同，叶的结构有所不同。下列哪一项有利于叶片吸收转化光能（）

OR指令的作用是: 。( )

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.

三元催化器的转化效率与发动机的空燃比在（）时，其转化效率最高。

光能转化效率

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。

绿色植物和光合细菌都能利用光能将（）合成有机物，它们都属于光养生物。从广义上讲，所谓光合作用，是指光养生物利用（）把（）合成有机物的过程。