电商企业年需A商品3000件,单价300元/件,年保管费率为15%,每次订货成本为500元。(1)求经济定购批量和库存平均储存量。(2)求年订货次数、订货时间间隔及与订货相关的年总库存成本。
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There _____ an apple and three books on the table.
A. are
B. is
C. am
D. were
______ no eed for us to discuss the problem again since it has already been settled.
A. It has
B. There has
C. It is
D. There is
They are _____ a meeting.
A. having
B. taking
C. on
D. in
If this project fails it will affect _____ our department, _____ the whole arganization.
A. not only...but also
B. both...and
C. as...as
D. so...as