金属封装主要采用金属和玻璃密封工艺,金属作封装底盘、管帽和引线,()做绝缘和密封。A 发布时间:2019-11-16 08:36 │ 来源:www.tikuol.com 题型:单项选择题 问题: 金属封装主要采用金属和玻璃密封工艺,金属作封装底盘、管帽和引线,()做绝缘和密封。A.塑料B.玻璃C.金属
题型:单项选择题 The film 1942 was___ moving ____ I couldn’t help crying when I was I saw it.A.too, toB.so; thatC.enough; toD.very; that 查看答案