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【简答题】
用20CrMnTi制造汽车变速箱齿轮,要求齿面硬度HRC58-60,中心硬度HRC30-45, 试写出加工工艺路线如下:锻造→热处理1→机械加工→热处理2→喷丸→磨齿。试写出各热处理工序的名称及作用。
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举一反三
【单选题】Questions 11 to 15 are based on the following passage: Today air travel is very common, but the first flights were very different from today. When air travel began in the 1920s, it was very expensive...
A.
Because it was too expensive.
B.
Because it was too uncomfortable.
C.
Because it was too dangerous.
D.
Because it was too noisy.
【多选题】图片的常见获取方法有哪些?
A.
网页图片另存下载
B.
电脑屏幕使用PrintScreen键
C.
滚动屏幕使用Snagit软件
D.
借助QQ截图快捷工具
E.
使用格式工厂转换图片
【简答题】功能凉血止血,治疗血热出血证的药物有____,____,____,____。(任选四味药)
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