常用缓冲液作为pH调节剂的是()
A.混悬液型注射剂
B.乳状液型注射剂
C.固体粉末型注射剂
D.输液剂
E.眼用溶液剂
参考答案:E
One third of our school _________ covered by trees, while the majority of our students ________ girls.
A.is, is
B.are; are
C.is; are
D.are; is
铁路客车电气综合控制柜如果Ⅰ路(Ⅱ路)电源出现故障,PLC自动转换到()电源供电,同时负载()运行。