一学生决心改掉迟到的毛病,遵守学校纪律,可冬天一到,他迟迟不肯起床,结果又迟到了。对该生的教育应着重培养()。
A. 道德认识
B. 道德情感
C. 道德意志
D. 道德行为
长度为1m的直导体,通过1A电流时,在磁场中某点,垂直磁场所受到的力为1N,则定位该点的磁感应强度单位即为1()
A. J
B. W
C. Wb
D. T
Examine the statement: SQL> CREATE TABLESPACE user_data 2> EXTENT MANAGEMENT LOCAL 3> SEGMENT SPACE MANAGEMENT AUTO; Which twp assumptions must be true for this statement to execute successfully?()
A. Oracle Managed Files are used for this instance.
B. The USER_DATA tablespace is managed using FET$/UET$ tables.
C. The COMPATIBLE initialization parameter must be 9.0.0 or higher.
D. Space within segments in the USER_DATA tablespace is managed with freelists.
采煤机牵引部闭式液压系统为什么要设补油与热交换回路?