常用布尔算符有：and、or、not等，当采用同义词进行检索时应当选用的算符是？

简述小学数学教学方法的含义，小学数学常用的教学方法有哪些？

Keyboard Error or no keyboard present.表示哪个配件有问题（）

8255有多种工作方式，A端口有（）种工作方式，B端口有（）种工作方式，C端口有（）种工作方式。

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。

面料经纬向判定，对于有布边的面料，与边平行的方向为（）（经向or纬向）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。