在金-瓷界面处理中,对化学结合方式有影响的是
A.钨钢打磨金属内冠表面
B.氧化铝喷砂处理
C.超声波清洗处理
D.用清水处理
E.预氧化处理
参考答案:D
22. ---- Do you know why the sun looks much bigger on the horizon?
---- Well, well, ______. I’ ve never read about that.
A.you really have me there
B.that depends
C.I can’t tell you
D.there is some doubt
某工程双代号网络计划如下图所示,其关键线路有()条。
A.2
B.3
C.4
D.5