在超微结构研究显示种植体与牙龈组织的结合方式是：（）
A.牙周膜
B.骨纤维界面
C.生物化学结合
D.半桥粒
E.机械结合
参考答案：D
____ in the area reported _____ three people robbing the bank with their heads wrapped in stocks.
A．Witness; to look at
B．Witnesses; seeing
C．Witnesses; looking out
D．Witness; to see
热退火酸洗线抛丸机每个抛轮可抛出丸粒（）kg/min。
