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【单选题】

thErE is supposED to BE A sAFEty _______ whiCh mAkEs it impossiBlE For trAins to ColliDE.
A．AppliAnCE
B．ACCEssory
C．mAChinE
D．mEChAnism

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根据网考网移动考试中心的统计，该试题：

1%的考友选择了A选项

23%的考友选择了B选项

3%的考友选择了C选项

73%的考友选择了D选项

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