Choose the correct relative pronoun: The automaton, ______ was designed by the boy's father, became the key to understanding their relationship.

What is the government's stance on the idea mentioned in the passage?

在C++中，以下哪个关键字用于定义一个类的构造函数？

在知识创造的新阶段，以下哪个因素变得极其重要？

在雾天行驶时，除了使用雾灯外，还应该使用哪种灯光？