❶ (2014石景山区一模)如图,⊙O是△ABC的外接圆,AB=AC,连结CO并延长交⊙O的切线AP于点P.(1)求证:
解答:(1)证明:连结AO并延长交BC于D、
❷ 2016年石景山英语初三一模c篇阅读译文 II. 31. B 32. D 33. A 34. B 35. C 36. A 37. C 38. B 39. C 40. D 41. B 42. D 43. C 44. D 45. A 46. B 47. A 48. B 49. A 50. C III. 51. G 52. H 53. I 54. F 55. D 56. E 57. B 58. C IV. 59. third 60. careful 61. building 62. themselves 63. mainly 64. natural 65. truth 66. scientistV. 67. doesn't have 68. How soon 69. didn't he 70. be done 71. anymore/longer 72. if/whether had 73. Instead ofVI. 74. D 75. C 76. B 77. A 78. D 79. A 80. B 81. D 82. C 83. B 84. A 85. C86. walked 87. almost 88. stupid 89. nothing 90. side/small 91. luck 92. pleased93. Because he lost his memory. / To ask for help.94. They felt surprised.95. He could make sentences without difficulty.96. A friend of his.97. In a perfect flat in downtown Manhattan.98. He had to meet his family and friends. /He had to continue his four - year course in photography. (Any reasonable answer is acceptable. )我是常年教初三的英语老师,有什么问题可以和我长期保持联系,我会尽力解答你的问题。 ❸ 2014年北京市石景山区初三一模成绩为463分,中考是基本上能考上哪些学校 你可以看<招生简章》啊。我是今年朝阳的考生,今天报志愿时就是根据招生简章走的。你可以上网上查一查往年的分数线,加油吧。石景山的九中,京源,石景山实验,佳汇,景山远洋分校不错哦 ❹ (2014石景山区一模)图甲为一款有高温、低温两档的家用蒸汽电熨斗,其工作原理电路如图乙所示,其中R1 (1)由公式P=
电熨斗在低温档正常工作10s,电流所做的功: W=P低t=1100W×10s=11000J;内 (2)从表中可知:容P高=1980W,P低=1100W, 则R2的功率为P2=P高-P低=1980W-1100W=880W, 故R2=
(3)电熨斗的实际功率:P实=
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