答:使用注射用盐酸四环素作静滴时,为防止意外,在使用之前应注意下述几点:(1)病人的体质;(2)病人的血液pH值;(3)病人血浆结合CO_2的能力。盐酸四环素溶液在pH4.0时最稳定。为使其溶液增加稳定性,在制成粉针时,加入了适量的维生素C或枸橼酸,故本品溶液呈酸性。用本品250mg加入到 A: The use of injection of tetracycline hydrochloride for intravenous infusion, in order to prevent accidents, before using should pay attention to the following points: (1) the patient’s physique; (2) the patient’s blood pH; (3) the patient’s plasma CO 2 ability. Tetracycline hydrochloride solution is most stable at pH 4.0. In order to increase the stability of its solution, when made into powder, add the right amount of vitamin C or citric acid, so the product solution was acidic. Use this product 250mg added to