《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 said that light ______ much faster than sound. [ ]
A. has travelled
B. went
C. travels
D. travelled
压实度检测有()方法。
A.环刀法
B.灌砂法
C.灌水法
D.核子密度仪检测
E.燃烧法