某企业每年耗用某种原材料1000千克，该材料的单位成本为15元，单位材料年持有成本为2元，一次订货成本90元，则下列说法正确的是()。
A. 该企业的经济订货批量为300千克，最低存货相关总成本为600元
B. 该企业的经济订货批量为300千克，最低存货相关总成本为4500元
C. 该企业的经济订货批量为600千克，最低存货相关总成本为300元
D. 该企业的经济订货批量为600千克，最低存货相关总成本为9000元
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At the Better Baby Institute, ______.
A. the idea of ''normal" achievement was challenged
B. children needed seven years to develop normality
C. unnatural development of normal children was achieved
D. normal children got the same achievements as brain-damaged children did
A．loseB．missC．cutD．place
A. lose
B. miss
C. cut
D. place
A．managingB．challengingC．changingD．developing
A. managing
B. challenging
C. changing
D. developing
By watching TV for several hours every night, Mander thinks that______.
A. people will lose their other senses
B. people will be very imaginative
C. people will become very passive
D. people will get less sleep
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