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【单选题】
《艺舟双楫》的作者是( )。A.
B.
C.
康有为
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举一反三
【单选题】I met a friend of mine _____ I was walking in the park.
A.
before
B.
when
C.
after
D.
if
【单选题】— How about walking home instead of taking a bus, Tom? — Er …… I think walking home does better to us, but it takes half an hour _____. [ ]
A.
so longer
B.
as longer
C.
so long
D.
as long
【单选题】“Walking in the street, I saw him.” has all the following possible meanings EXCEPT _____.
A.
As long as I was walking in the street …
B.
While I was walking in the street …
C.
As I was walking in the street …
D.
When I was walking in the street …
【简答题】试说明熔模铸造（精铸）的主要工艺过程，常用的模料有哪几种？他们的基本组成、性能、特点及应用场合如何？
【简答题】铸造特种用途低合金钢有哪几种？
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