目前计算机的主板多使用（）类型的机箱。A.AT B.PC C.ATX D.NLX

从适应市场需求的角度，按生产类型不同来划分，可供选择的方案可拟定为______

A．成本领先的生产战略方案

B．大批量生产战略方案

C．中批生产战略方案

D．重点化生产战略方案

E．单件小批生产战略方案

The United States is wellknown for its network of major highways designed to help a driver get from one place to another in the shortest possible time.　36　these wide modern roads are generally 　37　and well maintained, with 　38　 sharp curves and many straight 　39　,a direct route is not always the most 　40　 one. Large highways often pass 　41　scenic areas and interesting small towns. Furthermore, these highways generally 　42　 large urban centers which means that they become crowded with 　43　 traffic during rush hours,　44　the “fast, direct” way becomes a very slow route. However, there is 　45　always another route to take 　46　 you are not in a hurry. Not far from the 　47　 new “superhighways”,there are often older,　48　 heavily traveled roads which go through the countryside.　49　of these are good two lane roads; others are uneven roads 　50　 through the country. These secondary routes may go up steep slopes, along hilly　51　or down frightening hillsides to towns 　52　 in deep valleys. Though these are less direct routes, longer and slower, they generally go to places　53　the air is clear and the scenery is beautiful, and the driver may have a 　54　 to get a fresh, clean 　55　 of the world.

36. A. Although     B. Since  C. Because      D. Therefore

37. A. rough   B. splendid     C. smooth       D. complicated

38. A. little     B. few     C. much  D. many

39. A. selections     B. separations C. divisions    D. sections

40. A. terrible B. Possible     C. enjoyable   D. reasonable

41. A. to  B. Into    C. over    D. by

42. A. lead      B. connect      C. collect D. provide

43. A. large    B. fast     C. light   D. heavy

44. A. when    B. for      C. but     D. that

45. A. yet       B. still     C. almost D. quite

46. A. unless   B. if C. as       D. since

47. A. relatively     B. regularly    C. reasonably  D. respectively

48. A. and      B. Less    C. more   D. or

49. A. All       B. Several      C. Lots    D. Some

50. A. driving B. crossing     C. curving      D. traveling

51. A. rocks    B. cliffs   C. roads  D. paths

52. A. lying    B. laying C. laid     D. lied

53. A. there    B. when  C. which D. where

54. A. space    B. period C. chance       D. spot

55. A. view     B. variety       C. visit    D. Virtue

如图所示，一轻弹簧左端固定在质量为M的长木块上，右端固定在质量为m的小木块上．已知M＞m，且M与m之间接触面粗糙，M与地面间接触面光滑，开始时m和M均静止，现同时对m和M施加等大反向的水平恒力F₁和F₂从两物体开始运动至两物体速度达最大的整个过程中，设弹簧形变均在弹性限度内，则下列说法正确的是（　　）

A．对m和M组成的系统动量守恒，机械能不守恒

B．对m和M组成的系统动量不守恒，机械能也不守恒

C．F₁对m做的功等于m动能的增量与弹簧弹性势能的增量之和

D．F₁和F₂做的总功等于系统动能增量、弹性势能的增量与内能的增量的总和

在我国，公安机关是国务院和各级人民政府领导下的( )

A．行政职能部门
B．司法机构
C．综合管理部门
D．军事化机构

施工企业在签订建造（施工）合同时发生的差旅费应计入（）。

A．生产成本

B．期间费用

C．直接费用

D．间接费用