换热器在全部试压合格后,连接出入口短管及阀门,装上各种控制仪表,连续运行8小时,未发现任何问题,即可交付生产。
参考答案:错
解析:连续运行24小时,未发现任何问题,即可交付生产。
涎腺又称涎腺,由________、_________,________三对大涎腺以及位于口咽、咽部、鼻腔和上颌窦粘膜下层的小涎腺组成。
开放作文。
请根据下面提示,写一篇短文。词数不少于50。
In your English class, the teacher shows the picture below and asks the class to discuss it. Your
classmates may have different understandings. Look at the picture carefully and tell the crass how
YOU understand it.
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