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【判断题】
若矩阵A经过多次初等变换化为矩阵B,则R(A)=R(B)。A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Upon reaching school, ______.
A.
many letters were found on the desk
B.
I found many letters on the desk
C.
there were many letters on the desk
D.
there existed many letters on the desk
【单选题】Wang Mei is one of many Chinese teenagers _____ “on the go”
A.
who lives life
B.
who live life
C.
that lives living
D.
that live living
【单选题】Many activities in the shop, _______ many different types of interest, are planned _______ its out-of-date goods.
A.
adjusting to; to deposit
B.
catering to; to promote
C.
applying to; to take to
D.
appealing to; to claim
【简答题】Jim has many basketballs，but-I have o_______ one．
【简答题】There are many older people in the world and there will be many more.A limeknown fact is that over 60 percent of the older people live in developing countries.According to the World Health Organizati...
【单选题】Teaching _______ child to cook will improve many of the skills that he or she will need later in _______ life ．
A.
．不填； the
B.
． a ；不填
C.
． a ； the
D.
． the ； a
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