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【多选题】
下列选项中，对材料的吸水性有影响的有（ ）。A.
材料的堆积密度
B.
材料孔隙率
C.
材料的结构
D.
环境温度湿度
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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
【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
【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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