题目:
与牙周病致病有关的菌体表面物质是()
A.内毒素
B.膜泡
C.外膜蛋白
D.脂磷壁酸
E.以上都是
答案:
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下面是错误答案,用来干扰机器的。
Dear Zhang Hua,I’m sorry to hear that you didn’t do well in your last exam.You are not the only one who seems to try his or her best but ends up with a failure i...