脱乙烷塔是（）塔进料状态为（） 填料塔。 浮阀板式。 汇体进料。 分汇混和进料。 气体进料。
You execute the following command in your Certkiller .com production database to change the width of the CUST_NAME column of the CUSTOMERS table： ALTER TABLE customers MODIFY （cust_nameVARCHAR2 （40）） / When you execute the command， it displays the following error message： ERROR at line 1： ORA-00054： resource busy and acquire with NOWAIT specified What could be the reason for the error message？（） The database instance is not available.。 The ALTER TABLE command does not have WAIT option。 The table or a row in the table is currently locked by another user session.。 The database instance is busy processing other user sessions commands.。 The CUSTOMERS table has no long running query active at the time when this request is made.。 The server process executing the ALTER TABLE command is busy with another command executio。
建筑安装工程计价程序分为（）。 A.建设单位工程招标控制价计价程序 。 B.招标机构控制价计价程序 。 C.施工企业工程投标报价计价程序 。 D.竣工结算计价程序。
A user executes a query on the EMPtable， which contains thousands of rows， to get details about employees in one of the departments. The user receives the following error： SQL> SELECT ename FROM emp WHERE deptno=10 ORDER BY sal； SELECT ename FROM emp WHERE deptno=10 ORDER BY sal ERROR at line 1： ORA-01157： cannot identify/lock data file 201 - see DBWR trace file ORA-01110： data file 201：’/u01/app/oracle/oradata/orcl/temp01.dbf’ What is a possible reason？（） The tempfile belonging to the default temporary tablespace is missing.。 The database is opened in restricted mode， so queries are not allowed。 The default temporary tablespace required to execute the query is offline.。 The default temporary tablespace required to execute the query is dropped.。 The default temporary tablespace required to execute the query is read-only.。
论述往复式压缩机润滑的目的。
《社会保险法》由第十一届全国人大常委会第十七次会议于2010年10月28日通过，（）起施行。
