水泵运行中，当（）时会引起其电动机的电流过小。
A.叶轮中杂物卡住
B.吸水底阀打不开
C.水泵气蚀
D.轴承损坏
参考答案：B, C
慢性喘息型支气管炎的标志性症状是（）
A.胸痛
B.气短和呼吸困难
C.咳嗽
D.咳痰
E.喘息和胸闷
Directions: You are interested in a position of editor offered by a company. Write a letter of application to then to express your intention. Write your letter with no less than 100 words. Do not sign your name at the end of the letter. Use “Li Ming” instead. Do not write the address.
