慢性龈炎沟内上皮深层的炎性细胞浸润主要是
A.中性粒细胞B.浆细胞C.T淋巴细胞D.B淋巴细胞E.巨噬细胞
参考答案:C
---Excuse me, may I ask you some questions?
--- Sorry, I ’ m too busy and haven ’ t even a minute to ______.
A.spend
B.spare
C.offer
D.devote
采掘工程平面图的主要作用是什么?