洗胃时，每次灌洗胃液量为（）
A.少于100ml
B.少于200ml
C.300~500ml
D.500~800ml
E.800m
参考答案：C
Once he ______ his mind, nothing can be done to ________ his mind.
A．made up; change
B．has made up; change
C．changed; make up
D．has changed; make up
适合用间接盖髓术的是患牙
A．冠折露髓B．中龋备洞后C．备洞意外穿髓D．活髓牙全冠预备后E．深龋去腐未净露髓
