题目内容
同一公称直径的管子外径必定相同。
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闸阀在管道上没有安装方向。
截止阀在管道上是有方向性的,一般阀门上都标有箭头,箭头方向代表介质流动方向。
截止阀在管道上是有方向性的,若无箭头标注,应按“高进低处”的原则进行安装。
Mark: Miss Wang, I want to 1 ___________ an evening train to Harbin so that I can get there the next morning. Do you know the schedule?Miss Wang: Yes. I have got a 2 _____________________ here.Mark: Is there a train leaving around 6?Miss Wang: 3 ___________ one at 6:15.Mark: When will it get there?Miss Wang: It will 4 ________ there at about 8:00 next morning.Mark: That’s the one I need. Thank you very much.Miss Wang: You are 5 ________________ .
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