问题
单项选择题
所有法兰连接处应平整清洁、密封良好；密封橡胶垫的压缩量不应超过其厚度的（）。
A、l／3
B、l／5
C、l／8
D、l／10
答案
参考答案：A
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所有法兰连接处应平整清洁、密封良好；密封橡胶垫的压缩量不应超过其厚度的（）。
A、l／3
B、l／5
C、l／8
D、l／10
参考答案：A
Bare foot and dirty, the girl just sat and watched the people go by in the park. She never tried to 36 . She never said a word. Many people passed, 37 never did one person stop. The next day I decided to go back to the 38 , curious if the little girl would still be there. Right in the very 39 as she was yesterday, she sat with the 40 look in her eyes. 41 I began walking towards her, I could see the back of the little girl’s dress indicated a disability. I guessed maybe that was the 42 the people just passed by and made no effort to help. But I wanted to help her, so I 43 to let her know it was OK. I sat down beside her and 44 with a simple “hello”. The little girl was 45 and replied a “hi” in a low voice. I asked the girl why she was so sad. The little girl looked at me and said, “Because I’m 46. ” I immediately said, “That you are!”and smiled. The little girl acted 47 sadder, and she said, “I know.” “Little girl,” I said, “you 48 me of a sweet angel.” She looked at me and smiled. Slowly she stood to her 49 , and said, “Really?” “Yes, dear, you’re 50 a little guardian angel (守护神) sent to watch over (守护) all those people walking by.” She 51 her head “yes”. Then she spread her wings and said, “I am. I’m your guardian angel.” I was 52 by what I was seeing. She continued to say, “Because you think of someone other than (而不是) yourself, my job here is done.” Immediately, I also 53 to my feet and said, “Wait, so why did 54 stop to help an angel?” She looked at me and smiled, “You’re the only one who could see me, and you 55 an angel in your heart.”
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