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【单选题】
当空气中氧的含量降至______以下时，绝大多数物质的燃烧就会停止。
A.
11%
B.
18%
C.
21%
D.
16%
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【单选题】加权算术平均数的大小受各组
A.
次数的影响最大
B.
标志值的影响最大
C.
权数的影响最大
D.
标志值和次数的共同影响
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【简答题】my3+（133+44）=（my3+______）+44．
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【单选题】加权算术平均数的大小受各组
A.
次数（f）的影响最大
B.
标志值（x）的影响最大
C.
权重系数（f/∑f）的影响最大
D.
标志值（x）和次数（f）的共同影响
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【多选题】齿轮传动按润滑方式不同可分为()。
A.
开式
B.
半开式
C.
闭式
D.
半闭式
E.
以上说法都对
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【单选题】_____ the _____ of modern industry, the pollution is becoming more and more serious.A．With; deve
A.
44. _____ the _____ of modern industry, the pollution is becoming more and more serious. A．With; developing
B.
Under; development
C.
With; development
D.
Under; developing
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【单选题】It's 7: 44. Time ____________ breakfast. [     ]
A.
to
B.
for
C.
at
D.
in
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【简答题】 Passage 2 When people have more money than they need for ordinary ( 平常的 ) things, they sometimes spend their spare money in traveling and seeing other parts of the world. European ( 欧洲的 ) people go ...
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【简答题】Five students went out for a one-week trip in the countryside. When they returned, the group leader wrote a report about each student. _ A. He was getting on very well until he hurt his foot on the ...
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【简答题】Five students went out for a one-week trip in the countryside. When they returned, the group leader wrote a report about each student. _ A. He was getting on very well until he hurt his foot on the ...
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