问题
单项选择题
肠道杆菌的O抗原存在于（）
A.鞭毛
B.荚膜
C.菌毛
D.脂多糖
E.芽胞
答案
参考答案：D
解析：O抗原是肠道杆菌细胞壁脂多糖最外层的特异性多糖，为菌体抗原。
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肠道杆菌的O抗原存在于（）
A.鞭毛
B.荚膜
C.菌毛
D.脂多糖
E.芽胞
参考答案：D
解析：O抗原是肠道杆菌细胞壁脂多糖最外层的特异性多糖，为菌体抗原。
Leavenworth Industries has the following capital structure on December 31, 2008
| Book Value | Market Value | |
| Debt outstanding: | $8 million | $10.5 million |
| Preferred stock outstanding: | $2 million | $1.5 million |
| Common stock outstanding: | $10 million | $13.7 million |
| Total capital: | $20 million | $25.7 million |
A．①
B．②
C．③