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美刊《控制工程》1980年6月号发表了一篇专题报告,题为“电动机在工业控制中的使用”,作者向6个产业部门66,639名《控制工程》读者发出2,000份征询单,共收回693份。各产业部门读者及应答者的比例如下:
A special report was published on the June 1980 issue of the American Journal “Control Engineering” entitled “Use of Electric Motors in Industrial Control”. The author issued 2,000 inquiries to 66,639 “Control Engineering” readers of 6 industrial sectors. Withdraw 693 copies. The proportion of readers and respondents in various industrial sectors is as follows: