吗啡镇痛的机制是
A.抑制中枢PG合成
B.降低感觉神经敏感性
C.激动中枢阿片受体
D.阻断中枢阿片受体
E.以上都不是
参考答案:C
某套利组合如图所示,据图回答问题。
此组合的最大风险为()。
A.4
B.6
C.10
D.18
Because her family was poor, she _____her way through college, like washing dishes in the restaurant.
A.made
B.worked
C.felt
D.lost