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【多选题】
发动机按所用燃料分为()?A.
汽油机
B.
柴油机
C.
活塞式发动机
D.
转子式发动机
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【简答题】连词成句。 1. was, while, walking, I, saw, to, I, a, in, cat, school, a, tree 2. while, walking, was, car, the, exploded, past, I, it 3. said, he, living , he, in, was, London 4. I, speaking, to, you, yo...
【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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