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【单选题】
下列说法中,哪一项是正确的?A.
铝合金淬火处理后，在室温下自发强化的过程称为人工时效
B.
不能热处理强化的铝合金，可以采用冷作硬化来提高其强度和硬度
C.
铝合金构件在加工成型过程中，不能进行中间退火处理
D.
硬铝合金通常采用热水淬火
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举一反三
【单选题】When you study in the United States, usually you have to buy your own health().
A.
insurance
B.
expense
C.
evidence
D.
payment
【单选题】—What would you wish to do if you were a college student again? —That's very hard to say, but I wish I when I was a college student.
A.
has not studied biology
B.
did study biology
C.
had studied biology
D.
studied biology
【单选题】Seriously, (though), there's always (something you wish) you (have not done), but (what is done) cannot be undone.
A.
though
B.
something you wish
C.
have not done
D.
what is done
【单选题】— ______ you good luck! — ______.
A.
May, You also
B.
Hope, Hope you too
C.
Wish, So am I
D.
Wish, The same to you
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