写出镀膜过程应注意哪些参数变化?
参考答案:
镀膜过程中应注意真空度是否稳定、光量走值是否平滑无波动、蒸发速率稳定在设定范围内、电子枪能量是否稳定、离子源的各参数变化。
写作(满分30分)
Teenagers杂志Conversation With Brad栏目的负责人Brad收到了李华的一封来信。仔细阅读下面的来信,帮助Brad用英语写一封回信, 给出分析并提出合理建议。
Dear Brad,
I’m a student from Xinhua Senior High School. I have some difficulty communicating with my parents. Although I have tried my best, I find it really difficult to make them satisfied……So I feel lonely sometimes. I would be grateful if you could give me some advice.
Yours,
Li Hua
注意:1.可适当增加细节。
2.词数: 120-150。
Dear Li Hua,
I feel greatly honored to be trusted with your personal affairs.
加热器投运前检查的内容?