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【单选题】
曲轴的前后端都伸出曲轴箱，为防上曲轴前后端沿轴颈表面漏油，在曲轴前后端轴颈均有密封装置，主要有：填料油封、（）、甩油盘和挡油螺纹四种。A.
密封圈
B.
密封环
C.
自紧油封
D.
石槽绳
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举一反三
【单选题】Soft drinks _______ to children for free in some restaurants on Children’s Day.
A.
offer
B.
have offered
C.
are offered
D.
will be offered
【简答题】In the passage, the er of some parents in raising bicultural children is ______.
【单选题】The children are having a good time, ______ with sand, others with toys．
A.
some of them playing
B.
some of them are playing
C.
some of them
D.
who playing
【单选题】Some parents are always comparing their children __________other children. [ ]
A.
for
B.
to
C.
with
D.
as
【单选题】'Part-time' children______.
A.
spend some of their time with their half brothers and some of their time with their half sisters
B.
spend all of their time with one parent from the previous marriage
C.
are shared between the two former spouses
D.
cannot stay with 'full-time' children
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