阿片类镇痛药镇痛作用的主要机制为()
A.抑制环氧酶释放
B.抑制缓激肽释放
C.拮抗中枢神经阿片受体
D.激动中枢神经阿片受体
E.抑制前列腺素等的合成
参考答案:D
108个40是______,225的24倍是______.
He didn’t know __________
A.what kind of snake it is
B.what kind of snake is it
C.what kind of snake it was
D.what kind of snake was it