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。

在探究凸透镜的成像规律时，把蜡烛放在凸透镜前30cm处，光屏上可接收到倒立缩小清晰的像。则该凸透镜的焦距可能为（）。

放在凸透镜前10厘米高的蜡烛，通过凸透镜折射以后成的像高15厘米，则物距的范围在（ ）

教师在写凸透镜成像原理的教案时，想查找有关凸透镜原理的资料，则教师应该设置的关键字是（）。

凸透镜成像有多种情况，当物体放在透镜焦点之内时像结在（）。

中学物理课堂教学的基本课型主要有概念课、（）、实验课、习题课、复习课、探究课等。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。