与抗酸染色有关的细菌成分是()
A．蛋白质
B．多糖类
C．核酸
D．脂质
E．核蛋白
参考答案：D
Beijing is a beautiful city. And _____ foreign friends come to visit Beijing every month.[ ]
A. many thousand of
B. several thousands
C. two thousands
D. thousands of
安全生产目标三级控制内容是什么？
