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【多选题】
设A为 阶方阵,B是A经过若干次矩阵的初等变换后得到的矩阵,则有:( )
A.
B.
C.
若 ,则一定有
D.
若 则一定有
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【单选题】请根据下文回答下列各题:(41-45题) 2006年人才蓝皮书指出,在中国、美国、日本、德国、俄罗斯和印度六国人才国际竞争力排名中,中国位居第四位,仅排在俄罗斯和印度之前,属于第三层次。中国人才国际竞争力远低于排在第一位的美国,仅相当于美国的48%,总体差距非常明显。 不过,令人意外的是,我国人才浪费现象却比较严重。蓝皮书指出,一方面,七成知识分子走在“过劳死”的边缘;另一方面,人才资源能力发挥程...
A.
殚精竭虑
B.
胆战心惊
C.
趋之若鹜
D.
忧心忡忡
【单选题】前照灯的变光开关应 ( ) 在灯光开关与前照灯之间
A.
串联
B.
并联
C.
任意
【单选题】According to the passage, the camel maintains internal fluid balance in which of the following ways? I. By behavioral avoidance of exposure to conditions that lead to fluid loss II. By an ability to t...
A.
I only
B.
II only
C.
I and II only
D.
II and III only
E.
I, II, and III
【单选题】前照灯的变光开关应 ( ) 在灯光开关与前照灯之间
A.
串联
B.
并联
C.
任意
D.
串联或并联
【判断题】基坑上口的排水沟及集水井距基坑边不应小于 0.8 米。
A.
正确
B.
错误
【判断题】局部视图的范围用波浪线来表示。当表达的局部结构是完整的且外轮廓封闭时,波浪线可省略。
A.
正确
B.
错误
【单选题】前照灯的变光开关应( )在灯光开关与前照灯之间.
A.
白色
B.
黄色
C.
红色
【单选题】The passage suggests that the author would be most likely to agree with which of the following statements?
A.
Human dependence on computer technology has never been known to advance the species.
B.
Human dependence on computer technology should never be allowed under any circumstances.
C.
Human dependence on computer technology is a key component in the advancement of the species.
D.
Human dependence on computer technology cannot be accurately measured.
E.
Human dependence on computer technology can sometimes have a negative impact on society.
【判断题】世界上第一台电子计算机诞生于 1946年
A.
正确
B.
错误
【简答题】E Most of us are used to seasons. Each year, spring follows winter, which follows autumn, which follows summer, which follows spring. And winter is colder than summer. But the earth goes through tempe...
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