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【单选题】
常见的数据库系统有哪些？A.
MS SQL Server 、 MySQL 、 Oracle 、 DB2
B.
MS SQL Server 、 VC 、 Oracle 、 DB2
C.
MS SQL Server 、 MySQL 、 VB 、 DB2
D.
C# 、 MySQL 、 Oracle 、 DB2
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反馈参考答案：
举一反三
【简答题】用定义求下列函数的拉氏变换： (1)f(t)=e -2t (2)lf(t)=2t
【简答题】Congestion makes things worse: Cars caught in traffic jams pollute three times as much as those on the open road.
【单选题】Excuse me, but may I ask you _____? [ ]
A.
what business are you in
B.
what business you're in
C.
in what business are you
D.
are you in what business
【单选题】why didn't people in Bangladesh use a machine to replace the woman ?
A.
because they couldn't afford to buy a machine
B.
because they didin't know how to use a machine
C.
because the woman needed the work to support her family
D.
because the work could only be done manually
【多选题】在创业活动中，那些具有市场支配地位的经营者从事的哪项行为是违法行为?()
A.
没有正当理由，拒绝与交易相对人进行交易
B.
对条件不相同的交易相对人在交易价格上实行差别待遇
C.
因为转产、歇业以低于成本的价格销售商品
D.
以不公平的高价销售商品或者以不公平的低价购买商品
【单选题】( 浙江卷 )6. This machine _______. It hasn’t worked foryears.
A.
didn’t work
B.
wasn’t working
C.
doesn’twork
D.
isn’t working
【单选题】I'm sorry to_____you while you’re working，but I've got a question to ask you. ·
A.
distress
B.
bother
C.
disrupt
D.
interfere
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