原型化方法的实施是一个识别基本需求、开发 【20】 、模型验证和改进的循环过程。
参考答案：工作模型或原型
—Excuse me, which is the way to the Science Museum?
—Walk along Dongshan Road, it's next to a hospital. _______ [ ]
A. You won't pass it
B. You can't miss it
C. You don't lose it
D. You mustn't see it
已知F(x)=∫sin 2xdx，则F(x)的导函数F′(x)=（）。
A.2cos2x
B.cos2x
C.2sin2x
D.sin2x
