()是生产物流计划的核心内容,是生产物流计划和管理的依据。
A.MPS
B.ERP
C.FLS
D.PERT
参考答案:A
The discovery of the connection between aspirin and Reyessyndrome, a rare and deadly ailment , is a recent example of the caution with which drugs must be used, even for medical purposes.
A.disease
B.sick
C.ill
D.illness
如果直线3x-y+4=0与直线ax+2y-1=0垂直,那么系数a等于()。
A.选项A
B.选项B
C.选项C
D.选项D