A four-level (including red level, orange level, yellow level and green level) alerting and defense system was built and eight emergency response teams are always ready. Military drills were organized on an irregular basis in order to realize……
建立了红橙黄绿四级警戒防卫体系，有八个应急分队随时待命，不定期组织战队拉动演练，坚决做到