open

引用:

原帖由 sam524 於 12-6-2010 14:57 發表
有冇師兄識mechanical reasoning?
我大佬要考消防,佢要考mechanical reasoning...
有條例,但係唔識,有冇師兄識解?

The objest was fixed on one end. If some fore is applied to lift the other end, which di ...

消防隊長?