C1.8尺寸标注中的符号:R表示半径,φ表示直径,Sφ表示球,t表示[ ]。
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C1.9标注水平尺寸时,尺寸数字的字头方向应向上;标注垂直尺寸时,尺寸数字的字头方向应[ ]。
A. 向右
B. 向上
C. 向左
D. 向下
C1.20 在使用尺规绘图时,量取长度和分割线段的工具为[ ]。
A. 分规
B. 铅笔
C. 绘图板
D. 曲线板
Basketball by a Canadian doctor named James Naismith.
A. is invented
B. was invented
C. invented
D. invents
These cakes with chocolate. Have one, please.
A. fill
B. filled
C. are filled
D. were filled