有关普通型流脑的临床表现，不典型的是（）
A.头痛
B.呕吐
C.出血点
D.抽搐
E.巴宾斯基征阳性
参考答案：D
The fact that firms can make more adjustments to production methods in the long run gives the firm:（）
A. the ability to quickly adjust output.
B. a long-run supply curve that is steeper than its short-run supply curve.
C. a long-run supply curve that is more elastic than its short-run supply curve.
证券交易佣金全部是证券经纪商的业务收入。( )
