people have devised ever more cunning tools to cope with work that is dangerous,
问题描述：
people have devised ever more cunning tools to cope with work that is dangerous,
1,work为什么不用复数形式?
2,work后的that能不能用which代替?为什么?
答
这里的work是不可以名词.
由于没有特指,实际上这里有any work的意思.同样这里也就不可以用which替代了.