In this paper, we analysis the current situation of land use in Shijiazhuang proper, and suggest using politics, Law and economic lever, using extension and intension increasing land use.
通过石家庄市城区用地现状分析，提出利用政策法规和经济杠杆，采取外延扩大和内涵扩大相结合的用地对策。
While using lever rule, the fundamental law of phase diagram and use of standard terminology must be followed.
应用杠杆定律时，必须遵循相图的基本规律并使用标准术语。
Value contribution is the core factor to decide enterprise whether to operate reverse logistics or not. The law just plays a role in lever.
逆向物流活动的价值贡献是决定企业是否开展该项活动的核心因素，法律法规在其中只起杠杆调节作用。
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