下列实验操作:①过滤 ②溶解 ③蒸馏 ④取用药品 ⑤萃取 ⑥配制一定浓度的溶液,一定要用到玻璃棒的是( )
A:①②⑥
B:②③⑥
C:③④⑥
D:④⑤⑥
— In about three months.We are looking forward to the great event.
皮肤划破时会流血和感觉疼痛,说明皮肤含有( )