下列指标(量)中适宜采用u控制图进行监控的是()。
A. 超市每天的销售额
B. 生产过程中标准件的关键尺寸
C. 喷漆零件表面的不合格数
D. 某车间操作者每天生产的不合格产品数
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常用麝香草酚酒精的浓度是
A. 15%
B. 20%
C. 25%
D. 30%
E. 35%
在单因子方差分析中,因子A有4个水平,每个水平下各重复试验5次,则误差平方和的自由度为()。
A. 3
B. 4
C. 16
D. 20
If you are not happy with what you have got now, what makes you think that you will be happier with ______
A. anything
B. some
C. more
D. less
The government has provided the capital library with heavy ______ to keep it one of the largest in the world.
A. subscriptions B. tips C. subsidies D. bonuses