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【单选题】
如图 所示蜗轮受力简图中, _ _ _ _ _ 图是正确的。 A B C DA.
B.
C.
D.
D
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【简答题】Most people know that Marie Curie was the first woman to win the Nobel Prize, and the first person to win it twice．However, few people know that she was also the mother of a Nobel Prize winner． Born i...
【单选题】For a long time they walked without saying ___word . Jim was the first t break _____silence.
A.
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B.
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C.
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D.
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