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【单选题】
对库仑土压理论的假设，下列第（ ）种说法是正确的。A.
墙背光滑且铅垂
B.
墙背可不光滑但应铅垂
C.
墙背光滑但可为倾斜的
D.
墙背可不光滑且可为倾斜的
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反馈参考答案：
举一反三
【单选题】— What were you doing when I rang you yesterday afternoon? — I was occupied ______ the housework and kept my daughter occupied ______ her homework. [ ]
A.
at; doing
B.
at; to do
C.
with; doing
D.
with; to do
【简答题】烹调方法中，煮的操作要领是什么？
【简答题】( )的作用只是改变传动方向并不能改变传动比。
【单选题】— I rang you at about nine, But there was no reply. — Oh, that was probably ______ I was seeing the doctor. [ ]
A.
why
B.
when
C.
what
D.
that
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