题目内容

碳素钢管煨弯时，管子弯曲段加热温度须保持在（），才能弯出合格的弯管。

A. 650～750°
B. 850～950°
C. 750～850°
D. 950～1100°

查看答案

搜索结果不匹配？点我反馈

更多问题

In which scenario will you issue the following command？（） SQL> RECOVER DATABASE UNTIL TIME ’2005-10-04 ： 12：09：08’ USING BACKUP CONTROLFILE；

A. when all the control files are missing and only a binary backup of the current control file exists
B. when a multiplexed copy of the current control file is missing
C. when all the control files are missing and only a script containing the CREATE CONTROLFILE statement exists
D. when the SPFILE is missing

查看答案