What can be inferred about old nepotism

A．Parents maximized the family advantages for the benefits of their children.

B．Parents gave full respect to the likes and dislikes of their children.

C．Children had their own choice of career and marriage.

D．Children willingly lived on the expectations of their families.

使用喷灯时喷灯火焰与10kV及以上带电部分的安全距离不得小于（）。

（A）1m；

（B）1.5m；

（C）3m；

（D）6m。