题目

Academician (院士) Zhong Nanshan said Doctor Li Wenliang was _______hero when a reporter had __________interview with him. A . the; an B . a; an C . the; the D . a; a 答案：B实验过程中应注意：①向酒精灯内添加酒精时，不能超过酒精灯容积的________；②用试管夹夹持试管时，试管夹应夹持在距管口________处；③给试管内液体加热时，液体体积应不超过试管容积的________；给试管加热时，使试管倾斜________度．