性味苦寒的药物大多具有的功效是（）
A.祛风除湿
B.芳香化湿
C.清热燥湿
D.利水渗湿
E.活血通络
参考答案：C
Books are made _____paper and paper is made _____ wood and bamboo
A. from, from B. of, of C. of, from
使用检定管测定气体浓度时应注意哪些问题？
