【多选题】下列关于轴测投影的说法,哪些是正确的?请把所有正确的选项选出来。
C.
将物体放正(立体上的坐标面均与投影面平行),用斜投影法投影,得到的轴测投影图叫做正轴测投影图。
D.
将物体放斜(立体上的坐标面均与投影面倾斜),用正投影法投影,得到的轴测投影图叫做斜轴测投影图。
E.
轴向伸缩系数是轴测轴上的长度与相应空间直角坐标轴上的长度的比值,分别用p、q、r表示。
F.
与坐标轴平行的线段,可以在轴测图上沿轴向进行度量和作图。与坐标轴不平行的线段不能直接度量与绘制。
【单选题】This book was published in English, and now it has been translated into several other languages.
【单选题】直流电机如果不配置弱磁保护,则电机运行时发生弱磁会导致( )。
【判断题】这本书是鲁迅写的。 This book was wrote by Lu Xun.( )
【单选题】The author’s main purpose in writing this book was to __________.
A.
Teach the reader how to make chocolate.
B.
Entertain(娱乐) the reader.
C.
Express(表达) his disappointment in children.
D.
Persuade(劝说) the reader to eat chocolate.
【简答题】火眼金睛 The children must be taken good care. Can this bike mended? That pencil was given me by him yesterday. This book was write by him. He is often seen play football outside. The kite was made him b...
【单选题】( )可根据模具上安装加热器部位的形状,选用与之相吻合的结构形式