打开数据库必须用USE命令，而关闭数据库则可以不用USE命令。（）

可以在（）阶段采用Make-or-buy决策分析。

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（）.

打开表文件时，VFP自动打开该表的结构索引文件。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

打开一个数据库文件的同时打开以“姓名”为关键字的单一索引文件，要求查找姓名为“张伟”的教师，使用命令( )。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。