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【单选题】
某零件用 40Cr 制造,在强度、淬透性方面还不能满足要求,改用 可能能满足要求。
A.
50
B.
45
C.
5CrMnMo
D.
42CrMo
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A.
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B.
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A.
卡介苗肌内注射
B.
脊髓灰质炎疫苗皮内注射
C.
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D.
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