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【多选题】
下列各项成本中，与现金持有量成反比例关系的有()。A.
管理成本
B.
机会成本
C.
交易成本
D.
短缺成本
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举一反三
【单选题】What does “promises” in Stopping by Woods on a Snowy Evening imply?
A.
an appointment with friends
B.
the unavoidable responsibilities
C.
the obligation to his family
D.
the heavy burden of life
【单选题】What does “promises” in the poem imply?
A.
an appointment with friends
B.
the unavoidable responsibilities
C.
the obligation to his family
D.
the heavy burden of life
【单选题】What does the man think of Peter?
A.
He likes to promise.
B.
He never makes any promises.
C.
His promises are seldom kept.
【单选题】What does “promises” in “Stopping by Woods on a Snowy Evening” imply?
A.
the heavy burden of life
B.
the unavoidable responsibilities
C.
the obligation to his family
D.
an appointment with friends
【简答题】室内给水管道水力计算的目的是确定给水系统中的（）统所需压力。
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