【单选题】Luckily , we saw the sun rise in the top of Gushan Mountain.
【判断题】while的循环体语句必须要加一对{}。
【单选题】UML的类图中声明的类,主要包括三部分:
【简答题】The three-dimensional vector r , which has positive components, has magnitude 1 and makes angles of with each of the unit vectors i and j . The angle between r and the unit vector k is ° .
【单选题】相互商洽工作、询问和答复问题,或者向有关主管部门请求批准事项时要使用()公文。
【单选题】小肠经循行"出肩解","肩解"指的是()
【单选题】Which best defines the normal vector
A.
A vector that is perpendicular to the suce at a given point
B.
A vector that is parallel to the tangent plane at a given point
C.
A vector that lie in the tangent plane but perpendicular to the viewing direction
D.
A vector that is always perpendicular to the viewing direction