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【单选题】
如某投资组合由收益呈完全负相关的两只股票构成，在该组合的标准差为零时，组合的风险被全部消除。 ( )A.
正确
B.
错误
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举一反三
【单选题】— I hope the result of the exams had not been told to us. — ________, why did you come here to see our teacher? [ ]
A.
If what
B.
If so
C.
If only
D.
If not
【单选题】You never told us why you were late for the party, ______?
A.
did you
B.
had you
C.
didn't you
D.
hadn't you
【简答题】简述电子商务产生和发展的主要条件。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
【简答题】请简述电子商务产生和发展的条件
【单选题】She told us she had met you in London last year. _____ you _____ her since? [ ]
A.
Had-met
B.
Did -see
C.
Would-meet
D.
Have-seen
【简答题】下列说法正确的是() A电子商务将对人类社会产生重要的影响，包括提高了企业的准入条件 B企业对政府的电子商务简称为C2G C电子商务较之传统商业具有减少运营成本，显著降低收费的特点 D“电子商务是指对整个贸易活动实现电子化。”这一表述是联合国国际贸易程序简化工作组对电子商务的定义
【单选题】You never told us why you were late for the party, ______?
A.
weren't you
B.
didn't you
C.
had you
D.
did you
【单选题】You never told us his phone number，______ ?
A.
hadn’t you
B.
didn’t you
C.
had you
D.
did you
【单选题】计算机网络可分为三类，它们是()。
A.
Internet、Intranet、Extranet
B.
广播式网络、移动网络、点——点式网络
C.
X. 25、ATM、B--ISDN
D.
LAN、MAN、WAN
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