单项选择题
未知题型 金属活动顺序钾钙钠镁铝是按电极电位由小到大排列的。
判断题 全波整流时负载上的平均电压是半波整流情况下的2倍。
单项选择题 Brain Co is considering launching a new product. Expected sales volumes (at a selling price of $5 per unit) and expected unit variable costs are as follows. Sales Variable costs per unit Units Probability $ Probability 1,000 0.9 1.30 0.60 2,000 0.1 1.50 0.40 Fixed costs are expected to be $2,000. The company produces to order. What is the expected profit? A、$2,400B、$30C、$1,982D、$971