患儿7岁,左下第一恒磨牙在龋洞去腐过程中意外穿髓,应选的治疗方法为()
A.根管治疗
B.活髓切断术
C.干髓术
D.根尖诱导成形
E.塑化治疗
参考答案:B
用化学式表示:
①硫酸铁______;②烧碱______.
22. Today,_____rapid transportation and communication, the whole word seems to be smaller.
A.regardless of B.in spite of C.instead of D because of