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【多选题】
关于相对密度Dr的下列说法中正确的是（）。A.
从理论上讲，用Dr划分砂土的紧密程度是合理的
B.
砂土的Dr测定误差较大
C.
砂土的天然孔隙比e较难测定
D.
当Dr＝0时表示砂土处于最紧密状态
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反馈参考答案：
举一反三
【单选题】“乡土诗人”（）的诗歌主要表现对生活的见解和态度，特别善于描写农村的破败和农民生活的艰难，代表作《老马》是一首只有8行的短诗，浓缩了丰富的生活内容与时代令人窒息的气息，是一首具有现代意识的乡土诗。
A.
卞之琳
B.
臧克家
C.
沈从文
D.
李广田
【单选题】We know it is hard to make such a decision _______ he has just built up the team and the project is going through the important stage now. [ ]
A.
that
B.
as
C.
when
D.
before
【简答题】If he _____giving up smoking, he can make it. A) sets the mind on B) sets his mind on C) has a mind D) gives his mind to
【单选题】______ he has made up his mind, no one can make him change it.
A.
Unless
B.
Once
C.
Until
D.
As
【单选题】______he has made up his mind, no one can make him change it.
A.
Although
B.
Unless
C.
Until
D.
Once
相关题目：
【单选题】______ he has made up his mind, no one can make him change it.
A.
Unless
B.
Once
C.
Until
D.
As
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