我区村（社区）级避孕药具的标准库存周转量为1个月。
参考答案：对
From their _____ on the top of the TV Tower, visitors can have a better view of the city. [ ]
A. stage
B. position
C. condition
D. situation
密度聚乙烯膜作为防渗材料具有哪些特点？
