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【单选题】
阀控型锚机的闭式液压系统的高位油箱的作用是__。A.
为系统补油
B.
容纳系统油温升高时的膨胀量
C.
冷却系统油液
D.
净化系统油
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A.
certify
B.
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C.
munch
D.
Enumerate
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【单选题】The fishing village where they went on a journey lies in is now part of Hainan province.
A.
where
B.
what
C.
which
D.
that
【单选题】Every minute should he made full use of_______our lessons. ?
A.
studying
B.
to study
C.
study
D.
being studied?
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