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【简答题】
证明方程组 不存在形如 ， 的基本解组，这里λ 1 ，λ 2 是该方程组的系数矩阵A的特征值．
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皮皮学刷刷变学霸
举一反三
【单选题】下列说法正确的是( )。
A.
生态监测是比生物监测更复杂、更综合的一种监测技术
B.
生态监测重点是放在生态系统的生物反应上
C.
生态监测是利用“生态”来作“仪器”进行监测环境质量
D.
上述说法都对
【简答题】A fall B decrease C refuse D rise
【单选题】A refuse collection becomes a "sanitary engineer" because ______.
A.
"refuse collector" is a job people don't like to do
B.
"refuse collector" is too formal
C.
people enjoy freedom in their choice of words
D.
the elegancy of language is admired by the American people
【简答题】宏观生态监测和微观生态监测两者之间有何区别与联系?
【单选题】What does “He wisely refuse to spend his money.”mean?
A.
it was wise of him to refuse to spend his money
B.
[B]he refuse to spend his money in a wise manner
C.
he was short of money and didn’t want to buy anything
D.
he refuse,in a wise manner, to spent his money.
【单选题】The environmentalists said wild goats’ __________ on the vast grasslands was a good indication of the better environment.
A.
escape
B.
absence
C.
attendance
D.
appearance
【单选题】The environmentalists and wild goats' _____ on the vast grasslands was a good indication of the better environment. [ ]
A.
escape
B.
absence
C.
attendance
D.
appearance
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