给你提供两根保险丝,燃完一根正好历时1分钟,但因材质不均匀,分段燃点时,时间与长度不成比例。你能否利用它们来准确定出45秒的时间?方法如下:同时点燃一根保险丝的两端及另一根保险丝的一头。当第一根保险丝烧光时(半分钟以后),马上点燃第二根保险丝的另一头。这样一来,第二根烧完时,时间刚好走过45秒。上述做法可用于只允许在两头点燃的情形。如果允许在中间点火,再添加一些 To provide you with two fuses, burning a just last one minute, but due to uneven material, sub-lit, the time and length disproportionate. Can you use them to accurately set the time for 45 seconds? Here’s how: Simultaneously light both ends of one fuse and one of the fuses. When the first fuse burns (half a minute later), immediately ignite the other end of the second fuse. As a result, the second root burn time, just passed 45 seconds. This can be used to allow only two lights in the case. If allowed to fire in the middle, add some more