【单选题】【消耗次数：1】
The Peoples Republic of China ___ on October 1, 1949.
①
found
②
was founded
③
is founded
④
was found
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相关题目
【单选题】
1. The Peoples Republic of China ___ on October 1, 1949.
①
found
②
was founded
③
is founded
④
was found
【单选题】
Do you know the year ______the Chinese Communist Party was founded?
①
which
②
that
③
when
④
on which
【简答题】
I found it important __________ learn.[填空1]
【单选题】
—Have you found the bike you lost yesterday?—Yes, Ive found ______ already.
①
it
②
that
③
the one
④
that one
【单选题】
I found a ___________ young man lying on the ground.
①
wound
②
wounding
③
wounded
④
wounds
【单选题】
He found it hard to ( ) his studies in such a noisy environment.
①
devote to
②
dwell on
③
concentrate on
④
depend on
【单选题】
When we came back, he found his bicycle ____
①
was stolen
②
had stolen
③
had been stolen
④
is stolen
随机题目
【单选题】
下列说法错误的是（）
①
若n阶线性方程组Ax=b的系数矩阵行列式|A|<SPANstyle="FONT-SIZE:10.5pt；FONT-FAMILY:宋体；mso-bidi-font-family:TimesNewRoman；mso-font-kerning:1.0pt；mso-ansi-language:EN-US；mso-fareast-language:ZH-CN；mso-bidi-language:AR-SA">≠0</SPAN>，则该方程组存在唯一解；
②
若n阶线性方程组Ax=0的系数矩阵行列式|A|≠0，则该方程组只有零解；
③
一个行列式交换两列，行列式值不变；
④
若一个行列式的一列全为零，则该行列式的值为零
【单选题】
设A和B皆为n阶方阵，则下面论断错误的是()。
①
A与B等价的充要条件是rank(A)=rank(B)
②
若A与B等价，则|A|=|B|
③
A与B等价的充要条件是存在可逆阵P、Q，使A=PBQ
④
A可逆的充要条件是A等价于E<SUB>n</SUB>
【单选题】
对n阶实矩阵A和非零常数k，下列等式中正确的是（ ）
①
|kA|=k<SUP>n</SUP>A
②
|kA|=k<SUP>n</SUP>|A|
③
|kA|=k|A|
④
|kA|=kA
【单选题】
集合A={a,b,c}，A上的二元关系R={<a,a><A,A>,<B,B>,<A,C><b,b><a,c>}，则R具有以下性质（）。</a,c></b,b></a,a>
①
自反性、反对称性、传递性
②
反自反性、反对称性、传递性
③
对称性、传递性
④
反对称性、传递性