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【单选题】
（ 22 ）对 SQL Server 2000 采用的备份和恢复机制，下列说法正确的是A.
）在备份和恢复数据库时用户都不能访问数据库
B.
）在备份和恢复数据库时用户都可以访问数据库
C.
）在备份时对数据库访问没有限制，但在恢复有系统管理员可以访问数据库
D.
）在备份时对数据库访问没有限制，但在恢复时任何人都不能访问数据库
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【单选题】They believe that if you want to do well in an increasingly specialized world, you must concentrate on a single area and become an expert in that field, forsaking all other subjects
A.
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B.
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C.
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D.
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