G+细菌不具备的成分是
A.肽聚糖
B.脂多糖
C.磷壁酸
D.N-乙酰胞壁酸
E.N-乙酰葡糖胺
参考答案:B
—Which kind of juice would you prefer, pineapple or orange?
—_____. I must say I’ve a strong preference for tea.
A.Both
B.None
C.Neither
D.Either
骨髓瘤好发于下列哪些部位()
A.肱骨
B.脊椎
C.肋骨
D.骨盆
E.胸骨