Backward integration strategy is especially effective when: ; and . 后向一体化战略在下列哪些条件下有效: ; 和 。
A、a firm's present suppliers are expensive 企业对现有供应商付出的成本过高
B、a firm's present suppliers are unreliable 现有供应商无法依赖
C、the availability of quality distributors is so limited 具有资质的渠道商很少
D、the industry is growing fast 所处行业正在快速增长