单项选择题
在ServerB的机器中,安装的是ERDB()数据库,相反在ServerA的机器中,则安装的是ERDB()数据库。
A备主
B主备
C主主
D备备
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单项选择题
Was there just a hint of () in his voice? She could not be sure.
A、souped-up
B、mockery
C、obligation
D、restrained
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单项选择题
The engineer didn’t do it,()?
A、isn’t he
B、doesn’t he
C、did he
D、didn’t he
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