质量管理点主要是针对需要重点控制的质量特性，（），薄弱环节以及影响因素等采取特殊的管理措施和方法。
参考答案：关键部位
You should have been more patient________that customer；I'm sure that selling him the watch was a
possibility.[ ]
A. of
B. with
C. for
D. at
散布图
