古诗文阅读。
                                                                                                   春望
                                                                                                     杜甫
                                                                                     国破山河在，城春草木深。
                                                                                     感时花溅泪，恨别鸟惊心。
                                                                                     烽火连三月，家书抵万金。
                                                                                     白头搔更短，浑欲不胜簪。

科学实验要规范操作，下列初中科学实验操作你认为不正确的是（　　）