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【简答题】
实际金属的晶体结构有哪些缺陷?
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反馈参考答案：
举一反三
【单选题】Egg prices usually ________ in spring when they are most plentiful.
A.
are dropping
B.
drop
C.
have dropped
D.
will drop
【单选题】Prices usually reflect
A.
only the value of a good to society.
B.
only the cost to society of making a good.
C.
both the value of a good to society and the cost to society of making the good.
D.
neither the value of a good to society nor the cost to society of making the good.
【单选题】House prices vary from place to place and are usually high ________ there are famous schools.
A.
when
B.
since
C.
where
D.
whether
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