问题
选择题
Mr Smith usually reads a newspaper _____ he's waiting for the bus. [ ]
A. if
B. then
C. because
D. while
答案
答案：D
搜题请搜索小程序“爱下问搜题”
Mr Smith usually reads a newspaper _____ he's waiting for the bus. [ ]
A. if
B. then
C. because
D. while
答案：D
某水泥销售公司6周内销售水泥情况如表2-1所示。若它们服从正态分布，订货的进货提前期为1周，一次订货费用为135元，每1吨水泥储存一周的保管费为6元，要求库存满足率达到95%。
若实行定量订货法控制，请确定该公司的订货点与订货批量。
|