Polylines take up more disk space than the equivalent lines and can’t be used to draw ordinary lines.
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If you have a particular requirement to perform certain tasks, you still need to use polyline.
A. 对
B. 错
Polyline and ordinary line have their advantages and disadvantages each, and you can choose to use them in accordance with your requirements.
A. 对
B. 错
零件的技术要求有（ ）。
A. 极限与配合，形状与位置公差
B. 零件表面结构要求
C. 对零件材料的要求与说明
D. 零件热处理及表面修饰要求
精基准的选择原则（ ）。
A. “基准重合”原则
B. “基准统一”原则
C. “自为基准”原则
D. “互为基准”原则
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