我们的作法是不把黑色氧化铜粉末与木炭粉末混和在一起,而是先把试管内用水润湿,然后将黑色氧化铜少许倒入试管,并旋转试管,使黑色氧化铜粉末均匀地敷在试管壁上薄薄的一层,然后将此试管放入烘箱内或在酒精灯上烘干备用 Our approach is not to mix the black copper oxide powder with the charcoal powder. Instead, we first wet the water in the test tube, then pour some black copper oxide into the test tube and rotate the test tube so that the black copper oxide powder will be uniformly applied. A thin layer on the wall of the tube, then place the tube in an oven or dry it on an alcohol lamp