丹毒的主要病因病机是:( )
A.风温夹痰凝结经络
B.风温湿热蕴结肌肤
C.从邪侵犯,血分有热,郁于肌肤
D.经络阻塞,气血凝滞
E.暑湿热毒流注肌间一
参考答案:C
函数y=x2-x3的单调增区间为______,单调减区间为______.
It’s really difficult to ______ what he is trying to express.
A.leave out
B.pick out
C.work out
D.make out