People were only shapes in dense, gray fog of dust and ash.
A. The dusty air made people barely visible.
B. The air was too polluted for people to breathe.
C. People hardly stayed in shape in such dirty air.
D. People were almost buried in thick dust and ash.
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根据对系统未来的预测，事先采取措施应付即将发生情况的控制方式是______。
A. 负反馈控制
B. 前反馈控制方式
C. 实时控制方式
D. 复合控制方式
The passage is mainly about （）.
A. lifelong training of employees
B. policies of lifelong employment
C. attitudes towards lifelong employment
D. employers' interest in lifelong employment
在物流包装设计需要考虑的因素中，______是首要因素。
A. 标志性
B. 装卸性
C. 作业性
D. 保护性
如企业产品品种少，市场需求稳定，物流活动简单，物流作业较为规范，则宜采用 ______组织结构。
A. 集权式
B. 分权式
C. 学习型
D. 网络型
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