Ⅱ期临床试验是指初步的临床药理学及人体安全性评价试验B．随机双盲法对照临床试验C．扩大的多中Ⅱ期临床试验是指初步的临床药理学及人体安全性评价试验 B．随机双盲法对照临床试验 C．扩大的多中心临床试验 D．新药上市后监测 E．生物利用度比较试验

selling speed. The retailer purchases a ________ variety of products and assumes a substantial risk in the marketing process. Retailer inventory ________ can be viewed as wide but not deep. Due to the high cost of store location, retailers place prime emphasis on inventory ________ and direct product profitability. Inventory turnover is a measure of inventory velocity and is calculated as the ratio of annual sales divided by average inventory.