《中药饮片质量标准通则＜试行)》的通知规定根茎、藤木类，叶类含药屑、杂质不得超过
A．2%
B．3%
C．0.5%
D．5%
E．1%
参考答案：A
_______ he has made a decision, it is not easy for you to make him change his mind.
A．Though
B．Unless
C．Once
D．Until
叁色不完全提花组织的织物正反面的纵向密度之比是（）。
