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【单选题】
棘轮机构的主要构件中,不包括()。A.
曲柄
B.
棘爪
C.
棘轮
D.
机架
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【简答题】Two strangers were sitting together in a plane . They were on a long journey . One of the men was a teacher . The other was a farmer . They sat without talking for a while , then the farmer said , “ L...
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A.
set off
B.
set back
C.
set up
D.
set aside
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