气柜开、停车排气操作？
参考答案：乙炔气柜不论开车前用氮气置换空气或检修前用氮气置换乙炔气都应按下述步骤进行排气：（1）停车时为减少损失，气柜高度均应控制在10%以下；（2）向水封加水封住气柜；（3）打开气柜顶部放空阀，将气柜钟罩放平，然后关闭放空阀；（4）打开气柜氮气进口阀，将气柜升至10—15%时停止充氮气，然后打开放空阀，将气柜钟罩放平，关防空阀。如此反复几次直到分析氮气中含乙炔﹤2.3%（动火时小于0.23%）或含氧量﹤3%；（5）如需进行气柜放水清理，必须先用氮气置换合格后才能打开顶部人孔及下部人孔（以使空气对流扩散）。
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| A beautiful girl was shopping with her mother in Blue-sky Market. It was 1 hard outside. Many people all stood there under the awning (遮雨篷). They waited, some patiently,others impatiently because of the bad weather. The girl's 2 was so sweet. "Mom, let's run through the rain,"she said suddenly. "What?" Mom asked. "Let's run through the rain!" "No, Honey. We'll 3 until it slows down a bit," Mom replied. The child waited about another. 4 and repeated, "Mom, let's run through the rain." "We'll get 5 if we do," Mom said. "No, we won't, Mom.That's not what you said this 6 " the young girl said as she tugged (拽) at her mom's arm. "This morning? 7 did 1 say we could run through the rain and not get wet?" "Don't you 8 ? When you were talking to Daddy 9 his cancer, you said, 'If God can get us through this, he can get us through 10 '!" The people became 11 . Nothing could be 12 but the rain.Mom thought for a moment about what she would say. "Honey, you are 13 . Let's run through the rain." 14 they ran off. People all stood watching, smiling and laughing as they 15 past the cars and through the puddles (水坑). They 16 their shopping bags over their heads. They got wet through, but they were 17 by a few who laughed like children all the 18 to their cars. People can 19 your money and health, but no one can ever take away your memories. So, don't 20 to make time to make memories every day. | ||||
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