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【单选题】
有减振和导向传力功能的弹性元件是（）A.
螺旋弹簧
B.
钢板弹簧
C.
油气弹簧
D.
扭杆弹簧
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A.
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B.
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A.
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B.
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D.
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A.
was really effective
B.
was a success story
C.
only worked in theory
D.
would save the boy's life
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A.
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B.
The; the
C.
A; the
D.
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