Mum , this is my ________ , Meimei.[ ]
A. father
B. sister
C. friend
C
把2.81,2.801,2.811,2.8011按从小到大的顺序排列.
______<______<______<______.
合成树脂胶涂胶厚度在()mm范围比较适宜。
A.0.015—0.02
B.0.04—0.05
C.0.1~0.5
D.0.5~1