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【简答题】
简述恶性肿瘤的异型性?
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举一反三
【单选题】While we axe making more use of nuclear power to meet the energy demand we should never neglect the ______ effect it can have on our living environment.
A.
contrary
B.
positive
C.
negative
D.
extensive
【单选题】we demand delivery of said goods in accordance () our contract.
A.
to
B.
for
C.
on
D.
with
【简答题】We demand that the tour guide (tell) ______ us immediately about any change in the schedule.
【单选题】We are faced with the demand that this tax_____.
A.
be abolished
B.
were abolished
C.
were to be abolished
D.
must be abolished
【简答题】Because of the steady increase in demand ______ our china ornaments we have decided to appoint an agent to handle our export trade ______ your country.
【简答题】max 一4x1+3x2 s．t．4x1+3x2+x3-x4=32， 2x1+x2一x3一x4=14， xj≥0，j=1，2，3，4．
【简答题】设α1=(1，一1，2，4)T，α2=(0，3，1，2)T，α3=(3，0，7，14)T，α4=(1，一1，2，0)T，α5=(2，1，5，6)T．问:α1，α2是否线性无关?如果线性无关，把α1，α2
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