壁厚小、易于成形的圆柱面和圆锥面壁板采用增量压弯成型。
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The LZ 129 Hindenburg, named after Hindenburg, a famous German general during the First World War and President of Germany.
A. Erich
B. Paul Von
C. Ferdinand von
D. Joseph
How many people were killed in the Hindenburg Disaster?
A. 35
B. 36
C. 62
D. 71
当直线段与投影面________时,则其在投影面上的投影反映真实长度,这种投影的基本性质叫________。
A.平行/积聚性
B.垂直/积聚性
C.平行/真实性
D.垂直/真实性
水平线在正立面上的投影________。
A.反映实长
B.缩短
C.积聚成点
D.伸长
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