牙拔除时不宜使用旋转力的牙为
A.上颌中切牙
B.上颌侧切牙
C.上颌尖牙
D.下颌中切牙
E.下颌双尖牙
参考答案:D
解析:下颌中切牙为扁根,使用旋转力易造成牙根折断。
食品安全国家标准由国务院哪个部门负责制定、公布?国家标准编号由哪个部门提供?
Franklin told them all ______ to be in Britain again.
A.he was how happy
B.how happy he was
C.how was he happy
D.he was happy how