用二氧化碳为介质提取挥发油的方法()
A.分馏法
B.超临界萃取法
C.渗漉法
D.压榨法
E.升华法
参考答案:B
His failure in the exam suggested that he __________ the teacher’s instructions.
A.can’t have followed
B.needn’t have followed
C.mustn’t have followed
D.shouldn’t have followed
党参药材的气味()
A.气强烈芳香,味苦辛
B.气微香,味苦,嚼之粘牙
C.气清香,味甜微辛,嚼之略带黏性
D.有特殊香气,味微甜
E.香气特异,味微甜、辛、苦