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试说明汽油机燃烧过程各阶段的主要特点,以及对它们的要求。 2 、爆燃燃烧产生的原因是什么?它会带来什么不良后果? 3 、爆燃和表面点火(早燃)有什么区别? 4 、何谓汽油机燃烧循环变动?燃烧循环变动对汽油机性能有何影响?如何减少燃烧循环变动? 5 、试说明汽油机燃烧室设计的一般要求。 6 、在汽油机上燃烧均质混合气有什么优点,它所面临的主要困难是什么?目前解决的途径有哪些?
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【简答题】A. newly-founded B. new-found C. newly-found D. new-founded
【单选题】Scientists say they have found key clues into how long we will live. One of them is a【C1】______handshake. British researchers believe a strong grip is not just a sign of confidence but also an【C2】____...
A.
firm
B.
loose
C.
warm
D.
friendly
【单选题】Scientists say they have found key clues into how long we will live. One of them is a (1)________ handshake. British researchers believe a strong grip is not just a sign of confidence but also an (2) ...
A.
firm
B.
loose
C.
warm
D.
friendly
【单选题】In the United States today, coffee is a more popular drink (1)_____ tea, but tea played (2)_____ interesting part in the history of the United States. Before they won their (3)_____ from Britain, the ...
A.
from
B.
against
C.
compared
D.
than
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【单选题】Mr. Wells has found some new clues in his investigation, ______ of great importance to solve this criminal case.
A.
I think which is
B.
that I think is
C.
which I think is
D.
which I think it is
【单选题】New ways _____ to prevent the river _____.
A.
have found out, from polluting
B.
have found, from being polluted
C.
have been found out, from being polluted
D.
have been found, from being polluted
【单选题】Walking around, I found the city was full of people _________ for the New Year’s festival.
A.
making up
B.
make up
C.
to dress up
D.
dressed up
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