L型细菌的特征下述哪项是错误的
A.抗原性改变
B.革兰染色多为阴性
C.呈多形性
D.需用低渗含血清培养基
E.对青霉素不敏感
参考答案:D
Many lifestyle patterns do such______great harm to health that they actually speed up ______weakening of the human body.
A.a;/ B./;theC.a;the D./;/
无龋者为
A.出生4个月婴儿
B.出生8个月婴儿
C.6岁儿童
D.16岁少年
E.30岁中年男性