使用430~490nm的高强度的以可见光为光源的窝沟封闭剂()
A.第一代封闭剂
B.第二代封闭剂
C.第三代封闭剂
D.第四代封闭剂
E.近年研究发明的封闭剂
参考答案:C
26. _____ about what he had done, the shy boy ran away as fast as possible.
A.Having embarrassed
B.Embarrassing
C.To embarrass
D.Embarrassed
患者MCV、MCH、MCHC均小于正常,最可能是()
A.慢性肝病性贫血
B.巨幼细胞性贫血
C.慢性失血性贫血
D.急性失血性贫血
E.再生障碍性贫血