关于清帝退位时提出的优待条件，下列说法错误的是（）。A、尊号保持不变 B、岁用400万

（15分）

如图所示，在足够长的光滑水平轨道上静止三个小木块A、B、C，质量分别为m_A=1kg，

m_B=1kg，m_C=2kg，其中B与C用一个轻弹簧固定连接，开始时整个装置处于静止状态；A和B之间有少许塑胶炸药，A的左边有一个弹性挡板（小木块和弹性挡板碰撞过程没有能量损失）．现在引爆塑胶炸药，若炸药爆炸产生的能量有E=9J转化为A和B沿轨道方向的动能，A和B分开后，A恰好在B、C之间的弹簧第一次恢复到原长时追上B，并且与B发生碰撞后粘在一起．求：

（1）在A追上B之前弹簧弹性势能的最大值；

（2）A与B相碰以后弹簧弹性势能的最大值．

单词拼写（共10小题；每小题1分，满分10分）

61. Yuan Longping is quite s_______ ( 满意的 )with his life.

62. Dr Yuan searched for a way to increase rice harvest without e______ (伸展，使变大)the area of the fields.

63. She spent her life c______ (参加运动)for women’s rights.

64. I love roast pork and f______ rice (炒饭)

65. You must ask for p______(允许) before taking pictures in the church.

66. She was so afraid of being laughed at by her friends that she did not c______(咨询) a doctor.

67. We missed the first few s______ (幕, 场) of the play because we were caught in the heavy rain.

68. Dinosaurs laid eggs too and e______ (存在)on the earth for more than 140 million years.

69. Swap summaries with your partner and give each other  c_______(评论).

70. It is so wet there that the trees are extremely tall, some m______(测量) over 90 meters.                                    

（）损失只发生在管路的直线段上。

液化石油气钢瓶属于下列哪种压力等级的气瓶？

土壤中的矿物质及其种类与特性