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【单选题】
在SQL Setver 2000中，为确保数据库系统能可靠地运行，不仅要考虑用户数据库的备份，也需要考虑系统数据库(不考虑tempdb)的备份。关于系统数据库的备份策略，下列做法中最合理的是 ______。A.
每天备份一次系统数据库
B.
每当用户进行数据更改操作时，备份系统数据库
C.
每当用户操作影响了系统数据库内容时，备份系统数据库
D.
备份用户数据库的同时备份系统数据库
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【单选题】听力原文：W: It looks like rain. Here take my raincoat. M: Thanks all the same, but I have an umbrella in my office. Q: Why dose the man not take the raincoat? (4)
A.
He doesn't think it will rain.
B.
He doesn't borrow things.
C.
He has an umbrella.
D.
He also has a raincoat.
【单选题】It looks like rain, so you’d better ______ without an umbrella.
A.
go
B.
not to go
C.
going
D.
not go
【单选题】It looks like rain. You______go out and watch TV at home.
A.
are better not to
B.
had better not
C.
wouldn't better to
D.
had not better
【简答题】— Shall I____the raincoat? —No hurry.Leave it _____it is.It looks like rain. A．put on;there B．put on;where C．put away;in the place D．put away;where
【简答题】题3．2．5图所示各电路在换路前都处于稳态，试求换路后电流i的初始值i(0十)和稳态值i(0_)。
【简答题】图示各电路在换路前都处于稳态,换路后电流i的初始值为 ,稳态值为
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