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【单选题】
下列陈述中不正确的是( )。A.
传输层是网络结构中高层与低层之间衔接的接口层
B.
传输层服务是一种标准服务，适用于提供不可靠的服务
C.
对高层用户而言，传输层屏蔽了通信子网的细节
D.
通信子网提供的服务越多，传输层协议就越复杂
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举一反三
【判断题】Two lines are parallel in space provided that their respective projections on two projection planes are parallel.
A.
正确
B.
错误
【判断题】If two lines in space are intersection, their projections will intersect also.
A.
正确
B.
错误
【简答题】n. 指示,表示,表明
【简答题】指示,表示,表明
【判断题】Whe two neighboring surfaces are in tangent condition, there is no line between their projections
A.
正确
B.
错误
【简答题】指示,表明,表示 n.
【单选题】What two types of projections give a pictorial view of the object without convergence?
A.
orthographic and perspective
B.
oblique and axonometric
C.
perspective and oblique
D.
isometric and orthographic
【单选题】Which of the following statements about projections is NOT true?
A.
The center of parallel projection is placed at a finite distance from the view plane.
B.
Projectors are not parallel to each other in perspective projections.
C.
In perspective projections, objects away from the viewpoint or center of projection appear smaller comparing to identical objects closer to the center of projection
D.
Proportions are maintained in parallel projections.
【简答题】指示;表明;表示
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