3. ___In the past two years, Myra seldom came to see her mother, but she wrote to her quite often.
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4. ___The old woman was quite sure that Myra would come to see her since eighty was a special birthday.
A. 对
B. 错
全剖视图用的剖切面可以用()
A. 单一剖切面
B. 几个平行平面的剖切面
C. 几个相交平面的剖切面
D. 柱面
基本视图除了常用的三视图以外,还包括()。
A. 仰视图
B. 斜视图
C. 右视图
D. 后视图
按照剖切面不同程度地剖开物体的情况,剖视图分为()。
A. 斜剖视图
B. 全剖视图
C. 半剖视图
D. 局部剖视图