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【单选题】
甲与乙订立合同后，有欺诈行为为由向人民法院提出撤销合同申请，人民法院依法撤销了该合同。下列有关被撤销合同的法律效力的表述中，正确的是（ ）。
A.
自合同订立时无效
B.
自乙提出撤销请求无效
C.
自人民法院受理撤销请求无效
D.
自合同被人民法院撤销后无效
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【单选题】Design of all the new tools and implements is based on careful experiments with electronic instruments. First, a human “guinea pig” is tested using a regular tool. Measurements are taken of the amount...
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A.
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B.
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