题干
8. The ________ goal of the book is to help bridge the gap between research and teaching, particularly the gap between researchers and teachers.
A：joint
B：intensive
C：overall
D：decisive
答案(点此获取答案解析）
C
的四条边为直径画半圆，重叠部分如图中阴影区域， 若向该正方形内随机投一点，则该点落在阴影区域的概率为 ( )
绳的另一端加一个力F，使球沿斜面由图示位置缓慢拉上顶端，各处的摩擦不计，在这个过程中拉力F 
