影像增强器阳极直流高压为()
A.10~15kV
B.15~20kV
C.25~30kV
D.30~35kV
E.35~40kV
参考答案:C
The monitor suggested that we ______ for a picnic on Sunday.
A.went
B.must go
C.could go
D.go
光镜下观察牙周组织近远中切片时可见到哪些结构。