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0,2,1,4,3,8,(),12 A. 5 B. 6 C. 7 D. 9
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:-5/6,0,3,8,7,()。A.4 B.1 C. 0 D. -2
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:-1,0,-3,-2,-5,-4,()。A.-7 B.-9 C.-11 D.-13
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0.2,6.8,-0.8,5.8,-1.8,4.8,(),3.8。 A.-2.8 B.3.8 C.-4.8 D.5.8
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-5/6,0,3,8,7,()。A.4 B.1 C. 0 D. -2
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-1,0,-3,-2,-5,-4,()。A.-7 B.-9 C.-11 D.-13
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铁碳合金中 钢的碳含量小于()。 A. 2.0% B. 2.5% C. 3.1% D. 4.0%