Formed from the gum of pines, amber is carbonized wood product.
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The raw material of the biological sciences has been subjected to ______.
桂枝适合于切( )
A. 极薄片
B. 薄片
C. 厚片
D. 斜片
E. 直片
According to a general definition, a mature tree would be at least ______.
治疗湿热郁滞肝胆，嘈杂吞酸应选用( )
A. 黄连
B. 酒黄连
C. 姜黄连
D. 萸黄连
E. 醋黄连
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