Suppose you were Zhang Dalong who will be graduating from Qinghua University this June. From the advertisement in Student Daily of April 10th, you got the information that a network maintenance engineer is to be employed. Write a letter applying for this position. In your letter, make sure to provide some necessary information like your qualifications , the courses you have taken, the practical skills you have grasped, the software you may have designed ,if any. (150 -200 words)