We are working with computer experts ____that such accidents do not happen again. (ensure)
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This shelf holds 80 pairs of shoes with prices ____from $120 to $150. (range)
Mary, I think you’d better change into something more suitable for your job interview. ( )
项目盈亏平衡产销量越低，表明项目（ ）
A. 投产后盈利越小
B. 抗风险能力越强
C. 适应市场 变化能力越弱
D. 投产后风险越大
进行线性盈亏平衡分析有以下前提条件：（ ）。
A. 当年产量等于当年销售量
B. 产量变化，产品售价不变
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