He concluded that empirical evidence supports the ___of these treatments.A.efficiency

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• Which of the following is not a possible cause of an unfavorable direct labor efficiency variance？下列哪项不是造成不利的直接劳动效率差异的可能原因？
• The responsibilities in handbook ______ that managers have to be concerned with efficiency and effectiveness in the work process
• The results of the Hawthorne test shows that the most important factor affecting production efficiency is at work.
• Metal hydrides, with varying degrees of efficiency,　can be used as a storage medium for hydrogen, often reversibly.