延胡索的药理作用有()
A.镇痛镇静
B.抗惊厥
C.抗心律失常
D.抗心肌缺血
E.抗血栓
参考答案:A, B, C, D, E
I want to have a short talk with you.Could you spare a few minutes________?[ ]
A. if necessary
B. if possible
C. if so
D. even if so
什么叫易燃油品?什么叫可燃油品?各举一例。