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问题 单项选择题

耶尔森菌属中目前确定对人类致病有关的有几个种( )

A．2个种
B．3个种
C．4个种
D．5个种
E．6个种

答案

参考答案：B

解析： 耶尔森菌属中目前确定对人类致病有关的是鼠疫耶尔森菌、假结核耶尔森菌和小肠结肠炎耶尔森菌。

阅读理解
                                                           Clean the Snow
     In the morning Mr Smith comes into the garden at the back of his house. 1_______
     Mr Smith wants to take his car out, so he asks a man to clean the road from his garage to the gate.
     He says to the man," 2        ___It will damage the flowers in my garden, and don't throw any on the
other side for it will damage the wall. 3                "Then he goes out.
     When he comes back, the path is clean. 4                But when he opens the garage to get his car out,
he sees: 5               
A.The garage is full of snow from the path,  and his car is under the snow !
B. He sees so much snow in the garden.
C. Don't throw any snow on that side.
D. There is no snow on the flowers, or the wall or the street.
E. And don't throw any into the street, or the policeman will come.
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问答题

ABC公司的一种新型产品原有信用政策N/30，每天平均销量为5个，每个售价为750元，平均收账天数40天；公司销售人员提出了新的政策，以便促销产品，新的政策包括改

变信用政策：“2/10，N/50”，同时以每个600元的价格销售，预计改变政策后每天能售出l0个，估计50%的客户会享受折扣，预计平均收账天数仍为40天。若一年按360天计算，企业资本成本率为10%，每个存货的储存成本是100元(其中含存货应计利息)，每次订货成本为144元，该新型产品的每个购买价格为500元。

要求回答以下的问题：

(1)计算公司该产品原有和改变政策后的经济订货量为多少最佳订货次数为多少？

(2)若单位缺货成本为5元，存货从提出到到达，正常交货期为5天，延迟交货1天的概率为0.2，延迟交货2天的概率为0.1，其他均能提前或按照正常交货期送达，则合理的保险储备和再订货点为多少？

(3)若按照前面所确定的经济订货量和再订货点进行采购，综合判断应否改变政策。
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