肺病及肾的五行传变是()
A.母病及子
B.相乘
C.子病犯母
D.相侮
E.以上均非
参考答案：A
________scores of times, but Derek still couldn’t understand how to use past participle in a concrete situation.
A．Having explained
B．Having been explained
C．Though it was explained
D．It was explained
适合于醛酮类挥发性成分分离的化学试剂是（）
A.亚硫酸氢钠
B.硫酸氢钠
C.硫代硫酸钠
D.吉拉德试剂
E.邻苯二甲酸酐
