A:实验中所取的红磷不足
B:实验中所取的红磷不足,瓶中氧气未反应完
C:插入燃烧匙太慢,塞紧瓶塞之前,瓶内已有部分空气受热逸出
D:实验时,没有将弹簧夹夹紧
_______ plays an important part in winning the fight against the serious disease?