下列哪种手术不属择期手术A．胃十二指肠溃疡的胃大部分切除术 B．甲状腺功能亢进的甲状

下列离子方程式正确的是( )

A．石灰石溶于醋酸： CaCO₃ + 2CH₃COOH = 2CH₃COO^－+ Ca²⁺ + CO₂↑+ H₂O

B．钠与硫酸铜溶液反应: Cu²⁺ + 2Na = 2Na⁺ + Cu

C．铁屑溶于过量稀硝酸：3Fe + 8H⁺ + 2NO₃^－＝3Fe²⁺ + 2NO↑+ 4H₂O

D．FeCl₂溶液中通入少量氯气：Fe²⁺ + Cl₂＝ Fe³⁺ + 2Cl^－

燃烧速度越慢的燃气越容易回火。

On August 26, 1999, New York City was struck by a terrible rainstorm. The rain caused the streets __36___ and the subway system almost came to a stop.

Unfortunately, this happened during the morning rush hour. Many people who were going to work were __37__ to go home. Some battled to __38__a taxi or to get on a bus. Still others faced the ___39___ bravely, walking miles to get to work.

I ___40__ to be one of people on the way to work that morning. I went from subway line to subway line only to find that most _41__ had stopped. After making my way __42__ crowds of people. I finally found a subway line that was __43___. Unfortunately, there were so many people waiting to __44__ the subway that I could not even get down the stairs to the ___45__. So I took the train going in the opposite direction, and then switched back to the downtown train. Finally, after what seemed like forever, the train __46__ my stop. Then I had to walk several blocks in the increasingly heavy rain. When I got to my office, I was _47___ through, exhausted and __48__.

My co-workers and I spend most of the day drying off. When it was 5:00 pm, I was ready to go home. I was about to turn off my computer __49__I received an email from Garth, my Director:

I would like to thank all of you who made the effort and __50__ reported to work. It is always reassuring (令人欣慰), at times like these, when employees so clearly show their _51__ _to their jobs. Thank you.

Garth’s email was short, but I learned more from that ___52__ message than I ever did from a textbook. The email taught me that a few words of __53__ can make a big difference. The rainstorm and the traffic __54___ had made me tired and upset. But Garth’s words immediately __55____ me and put a smile back on my face.

36. A. break        B. flood        C. sink          D, crash

37. A. forced       B. refused      C. adjusted      D. gathered

38. A. order        B. pay         C. call          D. search

39. A. climate      B. scenery     C. storm         D. burden

40. A. used        B. promised    C. deserved      D. happened

41. practice        B. routine      C. process       D. service

42. A. to          B. through      C. over          D. for

43. A. operating    B. cycling      C. turning        D. rushing

44. A. check       B. carry       C. find           D. board

45. A. street       B. ground       C. floor          D. platform

46. A. paused      B. crossed      C. reached        D. parked

47. A. wet        B. weak         C. sick            D. hurt

48. A. ashamed    B. discouraged    C. surprised       D. puzzled

49. A, while       B. when         C. where          D. after

50. A. hardly      B. casually       C. absolutely      D. eventually

51. A. devotion    B. donation       C. connection      D. reaction

52. A, accurate    B. urgent        C. brief          D. humorous

53. A. promise     B. appreciate      C. advice        D. guidance

54. A. troubles     B. signals        C. rules          D. signs

55. A. corrected     B. supported      C. amazed        D. refreshed

锅炉用水软化处理方法根据处理的位置不同可分为（）。

A、炉内水处理和炉外水处理

B、石灰法和离子交换法

C、石墨法和物理法

D、纯碱法和天然碱法

链传动机构中水平链和垂直链的垂度分别不超过多少？