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【简答题】
Fred was a young soldier in a big camp. During the week they always worked very hard, but it was Saturday, and all the young soldiers were free, so their officer said to them, "You can go into the town this afternoon, but first I'm going to inspect you." Fred came to the officer, and the officer said to him, "Your hair is very long. Go to the barber and then come back to me again." Fred ran to the barber's shop, but it was closed because it was Saturday. Fred was very sad for a few minutes, but then he smiled and went back to the officer. "Are my boots clean now, sir?" he asked. The officer did not look at Fred's hair. He looked at his boots and said, "Yes, they're much better now. You can go out. And next week, first clean your boots, and then come to me!"
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【单选题】短跑运动员拥有较高的快肌纤维百分比,运动过程中主要的供能系统是( )。
A.
糖酵解系统
B.
氧运输系统
C.
有氧氧化系统
D.
磷酸原系统
【单选题】在配合物[Cu(NH3)4]SO溶液中加入少量的Na2S溶液,产生的沉淀是()
A.
CuS
B.
Cu(oH)2
C.
S
D.
无沉淀产生
【单选题】已知命题:“如果a>b,那么2 a >2 b ”的逆否命题是(  )
A.
如果a≤b,那么2 a ≤2 b
B.
如果2 a >2 b ,那么a>b
C.
如果2 a ≤2 b ,那么a≤b
D.
如果a<b,那么2 a <2 b
【单选题】已知命题p:“如果a>b,那么2 a >2 b ”的否命题是(  )
A.
如果a≤b,那么2 a ≤2 b
B.
如果a<b,那么2 a <2 b
C.
如果2 a ≤2 b ,那么a≤b
D.
如果2 a >2 b ,那么a>b
【简答题】如果A=2×2×2×3,B=2×2×3×5,则(A,B)=______,[A,B]=______.
【简答题】如果A÷B=60,那么(A×3)÷B=______; 如果A×B=300,那么(A×2)×(B×2)=______.
【简答题】如果A÷B=54,则(A×2)÷(B÷2)=______.
【单选题】如果χ+2=a,那么χ=(  )
A.
a+2
B.
a-2
C.
2-a
【单选题】下列属于易裂变核燃料的是()A.钍-232 B.铀-233 C.铀-238 D.镎-237
A.
A
B.
B
C.
C
D.
D
【单选题】命题“如果x≥a 2 +b 2 ,那么x≥2ab”的逆否命题是(  )
A.
如果x<a 2 +b 2 ,那么x<2ab
B.
如果x≥2ab,那么x≥a 2 +b 2
C.
如果x<2ab,那么x<a 2 +b 2
D.
如果x≥a 2 +b 2 ,那么x<2ab
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