真空断路器是对密封在（）中的触头进行开断、关合的设备，利用电弧在真空中的扩散作用，电

把1.2米：80厘米化成最简整数比是______：______，比值是______．

It was the final examination. The class was very   36  . I was checking my paper   37   I saw my best friend, Samy,   38   to cheat at the exam. 

Samy scribbled（潦草地写） the   39   to some questions on his answer sheet   40   looking at a piece of paper. I was   41   and did not know what to do. My heart was beating   42   by each second. Suddenly, Samy noticed me staring at him.

He made a hand gesture, asking me not to   43   the teacher. I was deep in thoughts when the teacher said, “Time’s up! Please put down your pens! Stop   44  ! I will collect your papers.” I was waken out of my   45   upon hearing the loud voice of the teacher. I went home feeling very   46  . I was so frustrated   47   I even talked to my toys!

The next day, I went straight to the   48   office for I decided to tell the teacher that Samy   49   yesterday. I plucked up（鼓起） my   50   and walked into the office. I told the teacher that Samy had cheated. She was very angry. During break, she   51       Samy and Samy cried. He   52   his face as he ran out of the teachers’ office after he was scolded. After that incident, Samy always ignored me whenever I approached him. I was very sad. I thought my   53   with him must be over.

A few more days later, I was at the bus stop   54   for my bus when Samy came to me with a guilty look on his face. He said, “I’m sorry, I have now   55   cheating at the exam. Will you forgive me?” “Sure,” I replied with a smile. “But promise me never to cheat again.” “I promise!” he replied. Then we walked home happily.

36. A. silent             B. noisy                   C. crowded              D. dirty

37. A. while             B. when                    C. as                         D. whenever

38. A. wanting                     B. searching                  C. attempting                D. Wishing

39. A. sentences          B. words                  C. notes                    D. answers

40. A. before            B. after                    C. until                     D. once

41. A. glad                       B. anxious                 C. afraid                   D. sad

42. A. quicker and quicker                            B. harder and harder

C. slower and slower                              D. heavier and heavier

43. A. inform            B. phone                   C. tell                              D. ask

44. A. talking            B. writing                 C. looking                 D. thinking

45. A. thoughts          B. room                    C. soul                      D. seat

46. A. bad                B. worried                C. calm                    D. miserable

47. A. as                   B. which                  C. but                      D. that

48. A. school’s                 B. headmaster’s                C. teachers’               D. parents’

49. A. cheated        B. had cheated           C. was cheating          D. had been cheating

50. A. spirit              B. courage                 C. feet                      D. strength

51. A. hit                  B. beat                      C. told                      D. scolded

52. A. covered           B. washed                 C. lowered                D. raised

53. A. happiness      B. friendship             C. incident                       D. business

54. A. waited             B. to wait                        C. waiting                D. wait

55. A. appreciated      B. minded                 C. regretted              D. frightened

燃烧时出现回火如何处理？

发电机出口P？T的3YH（一部为1YH）为何要与发电机中性点直接连接？

男性65岁。夜间排尿4～5次，排尿费力，尿流缓慢，尿流量测定，最大尿流量9ml/h，应诊断为

A．肾肿瘤
B．尿路结石
C．肾结核
D．肾损伤
E．前列腺增生症