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【单选题】
差速器技术检验工艺要求，壳体应无裂损，壳体与行星齿轮、（）的接触面应光滑、无沟槽。A.
半轴齿轮
B.
半轴齿轮垫片
C.
十字轴
D.
行星齿轮
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反馈参考答案：
举一反三
【单选题】It is said that the library being built at present will be _______ what it used to be.
A.
twice as big as
B.
twice big than
C.
twice as much as
D.
twice much than
【单选题】The newly-built library is a ______ building.
A.
five-storey
B.
f ive storeys
C.
f ive-storey's
D.
f ive storeys'
【简答题】afraid [ə'freɪd]
【单选题】The new-built library is a_____ building .
A.
five-storey
B.
five storeys
C.
five-storey’s
D.
five storeys’
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