[多选题]运营突发事件的预防、响应、处置及善后工作应遵循以下原则 （ ）
A.以人为本、减少危害
B.安全第一、预防为主
C.统一指挥、快速反应
D.各司其职、协同配合
E.统一指挥、逐级负责

{{B}} Plants and Diseases{{/B}}
1 Plants, like animals, are subject to diseases of various kinds. It has been estimated that some 30,000 different diseases attack our economic plants; forty are known to attack corn, and about as many attack wheat. The results of unchecked plant diseases are all to obvious in countries which have marginal food supplies. The problem will soon be more widespread as the population of the world increases at its frightening rate. Even in countries which are now amply fed by their agricultural products there could soon be critical food shortages. It is easy to imagine the consequences of some disastrous attack on one of the major crops; the resulting famines could kill millions of people, and the resulting hardship on other millions could cause political unrest disastrous