盘式制动器的制动盘应平整、无变形,磨损后的厚度不应小于()。
A.3mm
B.4mm
C.5mm
D.6mm
参考答案:A
Don't miss the meeting. The questions to be discussed at it _____ of great importance.
A.is
B.are
C.was
D.will
胃黏膜内印戒细胞癌的诊断依据是()
A.组织学形态
B.PAS染色
C.CD68染色阳性
D.黏液卡红染色
E.AE1/AE3阳性