圆柱的投影特征是()。 What is the projection feature of cylinder?
A、三面视图是矩形。 Three views are rectangles of its projection.
B、一面视图是圆,另两面视图是矩形。 One view is a circle and the other two are rectangles.
C、两面视图是圆,一面视图是矩形。 Two views are circles and one view is rectangles.
D、三面视图都是圆。 The three views are circles.