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Dear Peter, I would like to know if I could ____ (要求) a casual leave of absence for one day on ____ (2月8日), this Wednesday. This morning I received a telephone call from my ____ (牙医), urging me to go to him for immediate treatment of my teeth. I have been experiencing a serious pain, depriving me of my sleep during ____(上一). The situation could worsen,should ____ (注射)occur. Concerning my classes I will miss, I think I can ____ (弥补)them in the evening at home. If possible, could you please send me the learning materials used ____(课堂上) ? I apologize for the ____ (不便)my absence from study may cause. Thank you for your consideration and I'm ____ (感激的) for the care and help you are generously offering ____ (一直)! Yours, Ann
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【简答题】( ) 1. The instructor's name is Ms. Smith. ( ) 2. Hector lives in Boston. ( ) 3. Mateo is from Puerto Rico. ( ) 4. The girl is from Pasadena. ( ) 5. The girl works in a diner.
【单选题】蒸汽管线吹扫时，附着于管内壁的铁锈、焊渣等杂质能够脱落下来的主要原因是（）。
A.
在蒸汽吹扫过程中，因蒸汽流速较快，铁锈、焊渣等杂质被冲刷而脱落下来
B.
在蒸汽吹扫过程中，因蒸汽流速较快、温度较高，铁锈、焊渣等杂质被强力冲刷，且因杂质温度比管壁平均温度高导致其膨胀程度大而脱落下来
C.
因管道金属膨胀系数小于杂质膨胀系数，在管道冷却与蒸汽吹扫交替进行时，铁锈、焊渣等杂质与金属管道之间产生热胀冷缩应力并借助于蒸汽冲刷力而脱落下来
D.
因管道金属膨胀系数大于杂质膨胀系数，在管道冷却与蒸汽吹扫交替进行时，铁锈、焊渣等杂质与金属管道之间产生热胀冷缩应力并借助于蒸汽冲刷力而脱落下来
【简答题】在作业本上完成学习通首页2.8课后作业并拍照上传。
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