已知X=21，Y=15，Z=22，计算表达式（（X>Y）or（Y>Z））and（（X<><>

已知表文件的表结构中有大学英语，高等数学，计算机基础和总分字段，且都是数值型，现要将所有同学的各门成绩汇总后存入到总分字段，使用命令（）

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（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

发送电子邮件时，对方的计算机必须打开电源。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。