答:药房常使用比重计来测量液体的比重,使用比重计要注意以下几点:(1)依比重计的长度选择适宜的容器,如测少量液体时可用量筒;(2)注意调整被测液体的温度(药典规定:除另有规定外,温度为20℃);(3)浸放比重计要从容器的中央轻轻放入,并应排除液 A: The pharmacy often use hydrometer to measure the proportion of liquid, the use of hydrometer should pay attention to the following points: (1) according to the length of the hydrometer to select the appropriate container, such as measuring a small amount of liquid can be used when measuring cylinder; (2) Liquid temperature (Pharmacopoeia: Unless otherwise specified, the temperature is 20 ℃); (3) The immersion hydrometer should be placed gently from the center of the container, and should be excluded from the liquid