【多选题】下列各项能够影响债券内在价值的因素有()。
【判断题】The parallelogram is parallel to the projection plane, and its projection on the projection plane accumulates into a line.
【判断题】When neighboring planes intersect, one should draw the projection of the intersection line
【单选题】搬动梯子时,应( ),并与带电部分保持安全距离。
【单选题】The projection line which connects frontal projection and profile projection is perpendicular to axis .
【判断题】The projection of a vertical line on the vertical projection plane must accumulate into a point.