What's the date today? [ ]
A. It's June.
B. Today is Monday.
C. It's December 14th.
答案:C
覆膜是将塑料薄膜涂上粘合剂,将其与以纸为承印物的印刷品,经橡皮滚筒和加热滚筒加压后粘合在一起,形成纸塑合一的产品。
下列哪种为革兰阳性菌细胞壁的特殊成分().
A.脂多糖
B.脂质
C.磷壁酸
D.肽聚糖
E.脂蛋白