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【单选题】
,.硅能显著的提高铁素体的强度和硬度,但含硅量超过( )时,将降低其韧性。A.
0.5%
B.
2%
C.
0.2%
D.
5%,
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A.
perspective
B.
view
C.
landscape
D.
scene
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A.
stood by
B.
stood out
C.
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D.
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