简述岩屑杂砂岩的一般特征。
坚持公有制主体地位，发挥国有经济（），离不开健全有效的国有资产管理体制。 ["主导作用","控制作用","决定作用","辅助作用"]
人工流产综合反应
In base e-Commerce module designs, where should firewall perimeters be placed?（） [" core layer"," Internet boundary"," aggregation layer"," aggregation and core layers"," access and aggregation layer"]
五蕴
自然实验法
