“有名、无名”是“无名天地之始;有名万物之母”一句强调的重点。
查看答案
理解什么是地图符号化?符号化是空间数据生成地图过程中的一个关键技术步骤。
挡烟垂壁是指用不燃材料制成,从顶棚下垂不小于()MM的固定或活动的挡烟设施。
A. 200
B. 300
C. 400
D. 500
Each life preserver must be readily accessible to the person for whom it is intended while he or she is().
A. at work,only
B. in his or her berthing area,only
C. BOTH at work and in his or her berthing area
D. None of the above