五四运动后期,中国()以自己特有的组织性、纪律性和坚定的革命性:在运动中发挥了主力军的作用。
A. 农民
B. 工人阶级
C. 小资产阶级
D. 资产阶级
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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
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.