问题
单项选择题
离心泵的轴向推力的方向是（）。
A、指向叶轮出口
B、指向叶轮进口
C、背离叶轮进口
D、不能确定
答案
参考答案：B
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离心泵的轴向推力的方向是（）。
A、指向叶轮出口
B、指向叶轮进口
C、背离叶轮进口
D、不能确定
参考答案：B
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| There was a very special teacher who made a far-reaching difference in my life. Fa11,1959,the first day of class at Bethesda Chevy Chase High School was about to begin, "Who" . I asked a senior, "is Mrs McNamara, my l0th grade English teacher?" He just__1_and said something about my being in _2_. Soon,l understood what he meant. Mrs McNamara had a pattem of __3_that she repeated again and again. We would have a literature reading task for_4_.The next day, when we came to class, there would be two or three topics on the blackboard_5__ to the homework reading. We were _6_ to write an in-class essay about one of the topics. The following day , she would _7_ the corrected and graded essays andeach person would be called_8_to stand in front of the class and to _9_ his/her essay. The class were required to criticize(评论) that essay ,__10__ the grade of everyone in class would be reduced. The first time that I _11 her read-write-criticize method . I had not _12_ to do the homework and had written something without knowing what it meant._13_the extreme embarrassment I sufferred,standing before my classmates , _14_ myself. No one laughed at me;no one would be _15_ enough ,or foolish enough ,to do that in Mrs McNamara's class. The embarrassment came from_16_and along with it came a strong_17_not to let it happen again. Mrs McNamara kept all of our written work in files;it was easy to see the_18_ in writing that had occurred. What was not so easy to see was the inner transformation that had taken place, at least for me. What Mrs McNamara_19 me to do was to see myself as others see me and, having done that.l could improve myself. And I_20__. Thank you,Mrs McNamara. | ||||
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