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【单选题】
不可能是目标代码的是（）A.
汇编指令代码
B.
可重定位指令代码
C.
绝对指令代码
D.
中间代码
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【简答题】设A,B是阶矩阵,且A经若干初等变换化为B,则下面论断正确的是____。 A) 存在初等矩阵P 1 ,P 2 ,...,P t ,使B=P 1 P 2 ...P t A B) 存在初等矩阵Q 1 ,Q 2 ,...,Q t ,使B=AQ 1 Q 2 ...Q t C) 存在可逆矩阵P、Q,使B=PAQ D) 存在可逆矩阵P 1 、Q 1 ,使A=P 1 BQ 1
【单选题】News Directions N1-1
A.
To debate on the use of elephants.
B.
To campaign against the use of elephants.
C.
To pop the champagne corks and rejoice.
D.
To stop using performing elephants.
【单选题】News 2 N2-3
A.
Americans built support for laws forbidding voter discrimination.
B.
Discrimination against African-American voters came to an end.
C.
Existence of discrimination in the United States continued.
D.
Activists helped clear the path he followed to the White House.
【单选题】News 3 N3-5
A.
Albina’s son was killed in a helicopter accident.
B.
Albina’s son lost his life at age 25 in a mission in Mali.
C.
Albina’s son was a very dedicated search-and-rescue pilot.
D.
Albina’s son lost his life in a mission in 1986.
【单选题】News 3 N3-5
A.
Participate in the Olympics.
B.
Participate in the Paralympics.
C.
Participate in a swimming contest.
D.
Participate in a basketball .
【简答题】News report One(20190601N1)
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