题目内容
New inventions are public goods.
查看答案
搜索结果不匹配？点我反馈
更多问题
New incentives are public goods.
There are two steps in enforcement: Monitoring (watching, observing violations) and Sanctioning (punishing violators).
There are three steps in enforcement: watching, observing violations, and punishing violators.
Reducing the discharge of residuals into one environmental medium may just increase the discharges into other media.
微信支付 
支付宝支付