龈下菌斑主要为
A.革兰阴性厌氧者
B.革兰阳性球菌
C.需菌
D.衣原体
E.以上都不对
参考答案:A
现况调查又称为
A.前瞻性调查B.回顾性调查C.描述性调查D.横断面调查E.纵断面调查
Which process group focuses on completing the requirements of the project ?()
A.Initiating
B.Planning
C.Executing
D.Closing