草书结体采取的种种的化繁为简的方法是公认的约定俗成的准则,不能自己随意创造.
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轴瓦在不承受转子重量时,两侧垫铁用()mm塞尺塞不进,下部垫铁处有()mm的间隙
A. 0.02,0.05~0.07
B. 0.03,0.O5~0.07
C. 0.05,0.O5~0.07
D. 0.03,0.05~0.09
在装备恒速螺旋桨的航空活塞发动机上,飞行中首先能表明汽化器结冰的现象是().
A. 发动机转速下降;
B. 进气压力下降;
C. 发动机工作不稳定,接着转速下降.
综合比较圆周铣与端铣的优缺点,由于圆周铣具有较多的优点,在铣床上应用较广。
A. 正确
B. 错误
Your database has experienced a loss of datafile users_01.dbf, which is associated with a ablespace called USERS. The database is still running. Which answer properly describes the rder of the steps that you would use to recover from this error?() 1.Shut down the database. 2.Take the users_01.dbf datafile offline with the alter database command. 3.Restore the users_01.dbf datafile from backup media with the required archived redo logs. 4.Restore all users tablespace-related datafiles from backup media. 5.Issue the recover tablespace users command. 6.Issue the recover datafile users_01.dbf command. 7.Start up the database. 8.Bring the users_01.dbf datafile online with the alter database command.
A. 1,3,6,7
B. 2,3,6,8
C. 1,2,3,6,7
D. 1,2,3,6,,7,8
E. 2,3,6,5,7