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【单选题】
在进、排气门开闭的过程中,对充气效率影响最大的因素是( )。A.
进气门早开角
B.
进气门
C.
排气门
D.
排气门早开角
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皮皮学刷刷变学霸
举一反三
【单选题】Great changes have taken place since then in the primary school _______I am studying.
A.
where
B.
that
C.
which
D.
there
【单选题】Since settling in Scotland I ______ golf as a hobby.
A.
have taken up
B.
took up
C.
have taken in
D.
took in
【简答题】Cindy Rodgers
【单选题】Great changes ________ in the city since 1979.
A.
have taken place
B.
have taken the place
C.
have been taken place
D.
have been happened
【单选题】Great changes______ in the city since1970.
A.
have been taken place
B.
have taken place.
C.
has taken place
D.
took place
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