如图所示,画出斜面上物体所受的重力和斜面对物体支持力的示意图.
重力和支持力的作用点画在物体的重心上;重力的方向竖直向下;支持力的方向与斜面垂直,垂直斜面向上.如图所示:
第二节短文改错(满分15分)
Followed yoga (瑜伽) teacher's gentle instructions, Bai Yunuo, 76. ________
15, from the High School Attached to Beijing Normal University 77. ________
tried get each of her poses correctly. Bai's school offered 24 78. ________
elective course for Senior 1 students this term and she chose 79. ________
two. It was her first yoga class. "I'm happy what I can learn 80. ________
yoga at school. I love dancing so I have some injuries on my 81. ________
knees from which I was a kid. So I decide to try something 82. ________
soft. Simply stretching into different poses make me feel 83. ________
freely and quiet. At the meantime, the music is quite comforting. 84. ________
The class is relaxing after a whole day work." Bai said. 85. ________
设计概算的分级不包括( )。
A.单位工程概算
B.单项工程综合概算
C.建设工程项目总概算
D.单项工程概算