protective gap保护放电器,保险隙protectiveadj.保护的；防卫的protective uniform pant防护制服裤Protective installation保护配置protective forest belts护田林带protective coal pillars保护煤柱protective jurisdiction保护管辖权protective trade policy保护贸易政策protective trade system保护贸易制度protective baffle plate防护挡板protective inflammation防御性炎protective exploitation保护性开发