PTC陶瓷材料配方中常引入的添加剂有哪几类?
参考答案:
1)施主掺杂半导化添加剂;
2)移动居里点的移峰剂;
3)使晶界适度绝缘的添加剂;
4)形成玻璃相吸收杂质的添加剂。
I suggest that that we should take part in more such activities in future we did yesterday.
A.which
B.as
C.that
D.than
银行的情感营销是在( )的基础上注入人性化的营销理念。
A.专业化B.分层营销C.单一营销D.大众营销