从中药中提取化学成分最常用的方法是()
A.溶剂法
B.分馏法
C.升华法
D.蒸馏法
E.超临界流体萃取法
参考答案:A
The weather turned out to be fine yesterday.I the trouble to carry my umbrella with me.
A.should have taken
B.could have taken
C.needn’t have taken
D.mustn’t have taken
爵士演唱中的Scatting是指什么?()
A、喊唱
B、低吟
C、拟声唱法
D、气声演唱