液体由壳体进入计量室,驱动旋转活塞转动。旋转活塞的转动通过拨叉、连接磁钢传输到齿轮机构,进行器差修正。再传到(),进行流量积算。
A. 计量室
B. 偏心轮
C. 转数输出轴
D. 计数机构
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You issue this statement:ALTER DATABASE BACKUP CONTROLFILE TO TRACE; What does the statement generate?()
A text copy of the control file.
B. A binary copy of the control file.
C. A file containing a SQL statement which will re-create the database.
D. A file containing a SQL statement which will re-create the control file.
成人红骨髓位于()。
A. 扁骨的密质内
B. 短骨的松质内
C. 颅骨的板障内
D. 某些长骨骨端松质内
E. 髓腔内