[例题1]将军的谎言清朝时候,康熙皇帝派水军提督施琅将军去收复台湾。出发以前,将军用50个铜板在案板上占了一卦。结果50个铜板都是正面朝上,预示着出征必胜,于是士兵们士气大振。那么50个铜板都正面朝上是真的吗?我们来做个实验证明一下。①实验准备。②实验要求。③过程观察 [Example 1] Lieutenant Generals During the Qing dynasty, Emperor Kangxi sent a navy admiral Shi Lang to recover Taiwan. Before departure, the general with 50 pieces of copper on the board accounted for a hexagram. As a result, all 50 copper plates were facing upwards, indicating that they would win the war and the soldiers were very morale. So 50 copper are all face up is it true? Let's experiment to prove it. ① experimental preparation. ② experimental requirements. ③ process observation