【判断题】【消耗次数：1】
一个线性空间的任意两个子空间的交集都是空集。
①
正确
②
错误
参考答案：
复制
纠错
相关题目
【多选题】
假设complexType元素的名字空间前缀为“xsd”，现在需要定义一个复杂内容元素类型，该类型包含名称分别为“email”和“phone”的两个子元素，两个子元素的类型分别为事先已经定义好的“emailType”和“phoneType”，这两个子元素均出现一次，且可以以任意顺序出现，下面正确的选项是（）。
①
xsd:complexTypename="contactType"xsd:allxsd:elementname="email"type="emailType"/xsd:elementname="phone"type="phoneType"//xsd:all/xsd:complexType
②
xsd:complexTypename="contactType"xsd:allxsd:elementname="email"type="emailType"minOccurs="1"/xsd:elementname="phone"type="phoneType"minOccurs="1"//xsd:all/xsd:complexType
③
xsd:complexTypename="contactType"xsd:allxsd:elementname="email"type="emailType"maxOccurs="1"/xsd:elementname="phone"type="phoneType"maxOccurs="1"//xsd:all/xsd:complexType
④
xsd:complexTypename="contactType"xsd:allxsd:elementname="email"type="emailType"minOccurs="1"maxOccurs="1"/xsd:elementname="phone"type="phoneType"minOccurs="1"maxOccurs="1"//xsd:all/xsd:complexType
随机题目
【单选题】
They can’t leave until they _______ their work .
①
did
②
are doing
③
have done
④
his done
【单选题】
As I will be away for at least a year,Id appreciate________from you now and then so that I can know how everyone is getting along.
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having heard
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to hear
③
hearing
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being heard
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The dog,________,will be made a good watchdog.
①
to train properly
②
being trained properly
③
properly to train
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trained properly
【单选题】
—Have you searched the sitting room for your key?
—No. It was in the study________ I remember I left it.
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which
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where
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that
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as
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The monument(里程碑) was built in honor of the explorer who was believed________the river.
①
to have discovered
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to have been discovered
③
to discover
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having been discovered
【单选题】
Theearthisabout_______asthemoon.
①
as fiftytimebig
②
fiftytimesasbig
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asbigfiftytimes
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The English is GREAT campaign is intended to recognize outstanding individuals ______,every day and in many different ways,share their passion for the English language.
①
when
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which
③
who
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where
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The bridge which ________last year looks really beautiful.
①
was built
②
built
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was set up
④
had been built