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【单选题】
命题“?x∈R，x 2 +4x+5≤0”的否定是（　　）
A.
?x∈R，x 2 +4x+5＞0
B.
?x∈R，x 2 +4x+5≤0
C.
?x∈R，x 2 +4x+5＞0
D.
?x∈R，x 2 +4x+5≤0
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参考答案：
举一反三
【单选题】为了既能与国际标准UCS(Unicode)接轨,又能保护现有中文信息资源,我国政府发布了______汉字编码国家标准,它与以前的汉字编码标准保持向下兼容,并扩充了UCS/UniCode中的其他字符。
A.
GB2312
B.
ASCII
C.
GB18030
D.
GBK
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【单选题】The purpose of writing an argumentative essay is to determine the degree of truth of a(n) ______.
A.
story
B.
opinion
C.
conclusion
D.
side
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【单选题】In the 2 studies, the purpose of oven-drying the mixed soil was to remove all the:
A.
moisture.
B.
organic matter.
C.
soil test N.
D.
amino sugar N.
查看完整题目与答案
【单选题】The purpose of writing an argumentative essay is to determine the degree of truth of a(n) ______.
A.
story
B.
opionion
C.
conclusion
D.
side
查看完整题目与答案
【单选题】为了既能与国际标准UCS/Unicode接轨,又能保护现有的中文信息资源,我国政府发布了_______汉字编码国家标准,它与以前的汉字编码标准保持向下兼容,并扩充了UCS/Unicode中的其他字符。
A.
GB2312
B.
ASCII
C.
GB18030
D.
GBK
查看完整题目与答案
【单选题】The purpose of the Taguchi method is to ______.
A.
manage the flow of material for better visibility and control
B.
use statistical techniques to compute a "loss function" to determine the \r\ncost of producing products that fall to achieve a target value
C.
design, group and manage production operations as self-contained flexible \r\ncells capable of start-to-finish processing of a family of items
D.
regulate coordination and communication among process stages
查看完整题目与答案
【单选题】金属型铸造适用于制造那些零件( )。
A.
气缸体
B.
汽缸盖
C.
水泵叶轮
D.
铸锭
查看完整题目与答案
【单选题】为了既能与国际标准UCS（Unicode）接轨，又能保护现有中文信息资源，我国政府发布了（）汉字编码国家标准，它与以前的汉字编码标准保持向下兼容，并扩充了UCS/Unicode中的其他字符。
A.
GB18030
B.
GBK
C.
GB2312
D.
ASCII
查看完整题目与答案
【单选题】The purpose of this passage is to______.
A.
introduce the history of M. E. N. S. A.
B.
tell the story of Jenkins' life
C.
point out how to make good friends
D.
show the benefits of lifelong friendship
查看完整题目与答案
【单选题】The purpose of the specialized UN agencies is to handle many other worldwide problems apart from the UN's major mission.
A.
Y
B.
N
C.
NG
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相关题目：
【单选题】为了既能与国际标准UCS(Unicode)接轨,又能保护现有中文信息资源,我国政府发布了______汉字编码国家标准,它与以前的汉字编码标准保持向下兼容,并扩充了UCS/UniCode中的其他字符。
A.
GB2312
B.
ASCII
C.
GB18030
D.
GBK
查看完整题目与答案
【单选题】The purpose of writing an argumentative essay is to determine the degree of truth of a(n) ______.
A.
story
B.
opinion
C.
conclusion
D.
side
查看完整题目与答案
【单选题】In the 2 studies, the purpose of oven-drying the mixed soil was to remove all the:
A.
moisture.
B.
organic matter.
C.
soil test N.
D.
amino sugar N.
查看完整题目与答案
【单选题】The purpose of writing an argumentative essay is to determine the degree of truth of a(n) ______.
A.
story
B.
opionion
C.
conclusion
D.
side
查看完整题目与答案
【单选题】为了既能与国际标准UCS/Unicode接轨,又能保护现有的中文信息资源,我国政府发布了_______汉字编码国家标准,它与以前的汉字编码标准保持向下兼容,并扩充了UCS/Unicode中的其他字符。
A.
GB2312
B.
ASCII
C.
GB18030
D.
GBK
查看完整题目与答案
【单选题】The purpose of the Taguchi method is to ______.
A.
manage the flow of material for better visibility and control
B.
use statistical techniques to compute a "loss function" to determine the \r\ncost of producing products that fall to achieve a target value
C.
design, group and manage production operations as self-contained flexible \r\ncells capable of start-to-finish processing of a family of items
D.
regulate coordination and communication among process stages
查看完整题目与答案
【单选题】金属型铸造适用于制造那些零件( )。
A.
气缸体
B.
汽缸盖
C.
水泵叶轮
D.
铸锭
查看完整题目与答案
【单选题】为了既能与国际标准UCS（Unicode）接轨，又能保护现有中文信息资源，我国政府发布了（）汉字编码国家标准，它与以前的汉字编码标准保持向下兼容，并扩充了UCS/Unicode中的其他字符。
A.
GB18030
B.
GBK
C.
GB2312
D.
ASCII
查看完整题目与答案
【单选题】The purpose of this passage is to______.
A.
introduce the history of M. E. N. S. A.
B.
tell the story of Jenkins' life
C.
point out how to make good friends
D.
show the benefits of lifelong friendship
查看完整题目与答案
【单选题】The purpose of the specialized UN agencies is to handle many other worldwide problems apart from the UN's major mission.
A.
Y
B.
N
C.
NG
查看完整题目与答案
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