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【单选题】
地温表从东到西依次为5cm、10cm、15cm、20cm各表，一条直线放置，相距（）cm。A.
10
B.
15
C.
20
D.
5
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【单选题】关于余气系数α,下列叙述中错误的是( )。
A.
余气系数的物理意义表示贫油和富油程度
B.
α<1时为富油,α>1时为贫油
C.
航空发动机的余气系数一般为3.5~4.5
D.
在燃烧室的燃烧区和点火区,余气系数总是接近于5,这样对燃烧最有利
【单选题】2008 is a speical number， I think，that will never be forgotten by the Chinese people．
A.
one
B.
it
C.
the one
D.
what
【单选题】Which of the following statements is NOT correct?
A.
Chinese people account for 22 percent of the world's total population.
B.
The arable land in China constitutes seven percent of that of the world.
C.
Most Chinese people now can easily buy the necessities of life.
D.
Urban residents can eat nutritiously, but rural residents cannot.
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【单选题】关于余气系数α,下列叙述中错误的是( )。
A.
余气系数的物理意义表示贫油和富油程度
B.
α<1时为富油,α>1时为贫油
C.
航空发动机的余气系数一般为25~45
D.
在燃烧室的燃烧区和点火区,余气系数总是接近于1,这样对燃烧最有利
【单选题】关于余气系数α,下列叙述中错误的是( )。
A.
余气系数的物理意义表示贫油和富油程度
B.
α<1时为贫油,α>1时为富油
C.
航空发动机的余气系数一般为3.5~4.5
D.
在燃烧室的燃烧区和点火区,余气系数总是接近于1,这样对燃烧有利
【简答题】*What are the (1)____ of this product? *What are the (2)____ of this product? *What are the (3)____ of this product? *What are the (4)____ of this product?
【简答题】阅读理解。 As computers become all the morepopular in China, Chinese people areincreasingly relying on computer keyboardsto input Chinese characters. But if they usethe computer too much, they may end up f...
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