（）是由上位子房发育形成的真果；食用部分为肥大多汁的假种皮。
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建筑防水工程的资质等级为二级的企业可以承担各类房屋建筑防水工程的施工。（）
A. 正确
B. 错误
当输气站计量系统出现故障时，SCADA系统中将会出现报警，其中中控SCADA系统中流量计画面显示的报警有哪三种状态报警？
What is the output of this command?（）
A list of files that require a backup within 3 days
B. A list of files requiring more than 3 days of archivelogs to apply
C. A list of files that RMAN recommends be backed up only once in every three days, based on low volatility
D. A list of files for which a backup as already been performed in the last three days and which is required to be backed up again based on the high number of transactions performed on them
The pitch of a propeller is a measure of the（）.
A. angle that the propeller makes with a free stream of water
B. angle that the propeller makes with the surface of the water
C. number of feet per revolution the propeller is designed to advance in still water without slip
D. positive pressure resulting from the difference of the forces on both sides of the moving propeller in still water without sli
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