But the Don had insisted that he put in three years of general lawpractice in addition to his duties for the family business. Thisexperience had proved invaluable327 lateron, and also removed any doubts in Hagen's mind about working forDon Corleone. He had then spent two years of training in theoffices of a top firm of criminal lawyers in which the Don had someinfluence. It was apparent to everyone that he hada flair328 forthis branch of the law. He did well and when he went intothe full-time329 serviceof the family business, Don Corleone had not been able to reproachhim once in the six years that followed.
聚甲醛塑料,俗称赛钢,为结晶性热可塑性塑料,具明显熔点165~175℃,性质Zui接近金属。
优点 1、具高机械强度和刚性
2、Zui高的疲劳强度
3、环境抵抗性、耐有机溶剂性佳
4、耐反覆冲击性强
5、广泛的使用温度范围(-40℃~120℃)
6、良好的电气性质
7、复原性良好
8、具自已润滑性、耐磨性良好
9、尺寸安定性优
缺点 1、加工过程若长时间高温下易起热分解
2、无自熄性
3、抗酸性差
4、成形收缩率大
用途 电子电器:洗衣机、果汁机零件、定时器组件
汽 车: 车把零件、电动窗零件
工业零件:机械零件、齿轮、把手、玩具、螺杆