设备或系统从诞生至报废的整个期间所需要的费用总和被称为（)。A.计划成本B.生命周期

tion to a Tourist Attraction. You should write at least 120 words according to the following guidelines:

Your role: a tour guide

Your audience: a group of foreign tourists

Your introduction should include:

some welcoming words

the schedule for the day

a description of the place the tourists will be visiting(e, g. a scenic spot or a historical site, etc. )

You should make the introduction interesting and the arrangements for the day clear to everybody.

ntains one redo member. When you attempt to start the database, you receive the following errors:Which statement should you use to resolve this issue？（）

A. ALTER DATABASE DROP LOGFILE GROUP 1;

B.ALTER DATABASE CLEAR LOGFILE GROUP 1;

C. ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 1;

D. ALTER DATABASE DROP LOGFILE MEMBER ‘D:\REDO01.LOG‘;

ntains oneredo member. When you attempt to start the database, you receive the following errors:ORA-00313: open failed for members of log group 1 of thread 1ORA-00312: online log 1 thread 1: ‘D:\REDO01.LOG‘You discover that the online redo log file of the current redo group is corrupted.Which statement should you use to resolve this issue？（）

A. ALTER DATABASE DROP LOGFILE GROUP 1;

B. ALTER DATABASE CLEAR LOGFILE GROUP 1;

C. ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 1;

D. ALTER DATABASE DROP LOGFILE MEMBER ‘D:\REDO01.LOG

()your price be competitive and date of shipment acceptable, we intend to place a large order with you.

A、 If

B、 Should

C、 If should

to it.

A．connected

B．fastened

C．bound

D．stuck

A．fresh

B．capture

C．exposed

D．allergic