可采用旋转力量拔除的牙齿有（）。
A.上颌前牙
B.下颌切牙
C.上颌前磨牙
D.上颌磨牙
E.下颌磨牙
参考答案：A
What are they going to do next week [A] Going to visit West Hill. [B] Going to visit the West Hill Farm. [C] Going to visit Uncle Wang’s factory.
热媒炉切换时会使（）波动。
A、重油流量
B、重油温度
C、蒸汽流量
D、热媒流量
