与C型行为关系密切的疾病是（）
A.糖尿病
B.原发性高血压
C.冠心病
D.癌症
参考答案：D
蜗杆传动的类型有（）、（）、（）。
According to the 80/20 rule, 80 percent of the problems are because of 20 percent of the causes. To facilitate finding out which are the most probable defects, and to evaluate nonconformities, you do a rank ordering of the defects using ______ .
A．statistical sampling
B．control chart
C．Pareto diagrams
D．inspection
