很多考生解答高考物理难题时,总感觉已知条件少.有时是他们解答高考物理难题时,习惯一个已知条件用一次,不习惯同一条件多次运用,而高考物理难题多数需要一个已知条件用两次,少数需要用三次、极少数需要用四次.如果同一已知条件能多次运用,有的高考物理难题就会迎刃而解.下面用五个实例作些探讨,以便提高学生的解能力. Many candidates to answer physical challenges college entrance examination, the total feeling of known conditions .Sometimes, when they answer college entrance physical challenges, used to a known condition, not accustomed to the same conditions, multiple use, and college entrance examination most of the physical problems need a known condition Use twice, a few need to use three times, very few need to use four times .If the same known conditions can be used many times, and some physical challenges college entrance examination will be solved. The following five examples for discussion, in order to improve students’ ability to solve .