单项选择题

关于上述事故，我们最应当认识到的是( )。

A.偶然疏忽造成惨重事故
B．极其关键岗位的非常措施之必要
C．高度职业道德与职业技能的必需
D．上述事故皆由于高级技术人员的疏忽所致

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是指对已确定系统边界的物流系统，研究物料输入与输出系统的情况．包括物料输人输出工厂系统的方式(如运输车辆、装载容器、路线人口等)、频率及输入输出系统的条件(如时间、道路及工厂周围环境)等的统计资料。A．内部衔接B．外部衔接C．输入系统D．输出系统

A.包括物料输人输出工厂系统的方式(如运输车辆、装载容器、路线人口等)、频率及输入输出系统的条件(如时间、道路及工厂周围环境)等的统计资料。
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