题目内容

步进型矩阵板顺序控制器有何特点？

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围绕同一圆心或者多个圆心向四周或者某一方向发散，使人能够产生辐射状视觉效果的线组织，这种线组织称为辐射线。

A. 正确
B. 错误

Maximum and minimum working temperatures must be considered when choosing the joint, which must be so installed that it is neither over-compressed nor over-extendedThe bold and italic word "which "probably means （）.

A. maximum working temperature
B. minimum working temperature
C. the joint
D. the insulating material

开孔入户时，（）一般直径为的孔可穿放2条蝶形引入光缆。

瓦检器“跑正”、“跑负”的原因是什么？