简述布尔算符（OR）的作用。

接待印度、尼泊尔宾客时，茶艺师应用握手礼迎接宾客。

茶艺师为VIP宾客服务，每天都要了解VIP宾客的（）。

茶艺师应有优雅端庄站姿，给人以热情可靠、落落大方之感。

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。

苹果烂果病的发生规律，简述综合防治技术。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。