exam pc.exam.gg ${revision} 4.0.0 exam-module-mall pom ${project.artifactId} 商城大模块，由 product 商品、promotion 营销、trade 交易、statistics 统计等组成 exam-module-promotion-api exam-module-promotion-biz exam-module-product-api exam-module-product-biz exam-module-trade-api exam-module-trade-biz exam-module-statistics-api exam-module-statistics-biz