每半小时抽检15支冲压件，记录其总不合格数和单位不合格数。现抽了14个子样共查出不合格55个，若用此数据绘制“控制图，控制图的上控制限UCL为()。
A. 0.26
B. 0.54
C. 0.6
D. 0.65
完全预期理论认为存在可以系统影响远期利率的因素。()
A. 正确
B. 错误
当市场上对某项产品或服务的需求为负时,营销管理者应该实行刺激性营销,使负需求变成正需求。()
A. 正确
B. 错误
The author says Johnson found it difficult to walk because______.
A. he couldn't control his legs
B. he generally wore irons round his legs
C. people always stared at him
D. it hurt his friends to watch him
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