用钢尺在精密量距前必须加以(),确定该钢尺的尺长方程式。
A、检查
B、区别端点尺和刻线尺
C、检定
D、查清零点位置
参考答案:C
---Look at these stamps. I __________ them for five years.
---Wow, they are wonderful.
A.kept
B.have kept
C.have bought
D.bought
美容师要及时()与顾客发生纠纷的隐患。
A.关注
B.认识
C.对面
D.发现和消除