抗战开始后，南开大学、（）、北京大学迁往昆明，合并组建为国立西南联合大学

光敏二极管在光照射时产生的电流称为（）

(单选题)在光的照射下,材料的导电性( ),而电阻( )的现象叫内电光效应。(本题2.0分)

某种金属在光的照射下产生光电效应,要想使饱和光电流增大以及增大光电子的初动能,应分别增大照射光的 ( )

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.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

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。