问题
单项选择题
正常生产中当主风机出口流量三取二低于（）Nm3/h触发主风低流量联锁。
A.15000
B.19800
C.22280
D.36000
答案
参考答案：B
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正常生产中当主风机出口流量三取二低于（）Nm3/h触发主风低流量联锁。
A.15000
B.19800
C.22280
D.36000
参考答案：B
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| Mrs. White was wealthy. She lived alone in a large comfortable house where her children and grandchildren frequently (定期) came to visit her. However she was 1 . She spent a lot of time thinking about her old age and about her dead husband. Her children 2 about her and asked Dr. Green to see her. Mrs. Green was an experienced doctor, She knew old people became sad in their ways and don't like to be 3 what to do. She decided to get to know Mrs. White before she said anything. During the visit, Dr. Green asked Mrs. White to give her a 4 of the house. Mrs. White was 5 her house and happily agreed. As they walked from room to room, Dr. Green noticed that there were a lot of violets (紫罗兰) in every window. She asked, "Why do you have so many violets?" Mrs. White replied, "I love these flowers and they grow so fast that I have more and more." When the tour of the house was over, Dr. Green said "I have one 6 to make. Whenever you 7 a friend or a neighbour that is ill or getting married, give them one of your violets." Mrs. White said nothing about the doctor's advice and for a few months 8 the visit, she didn't give away any of her violets. Then one day she was invited to the 9 of her neighbour's daughter. She put a ribbon (彩带) on one of her potted (盆栽的) plants and took it to party. Later one of her friends was sick so she took a violet plant to him in the hospital. Gradually (渐渐地) she began to give more and more her potted violets to her 10 . Over the years she 11 so many that she became known as the 12 lady. | ||||
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