下列食品添加剂与类别对应正确的一组是[ ]
A．营养强化剂-亚硝酸盐
B．疏松剂-碳酸氢钠
C．调味剂-苯甲酸钠
D．防腐剂-味精
答案：B
Look! A group of people _____ together _____ music. [ ]
A. is getting, to dance to
B. are getting, to dance
C. is getting, to dance
D. are getting, to dance to
试述调速器静特性、转速死区的测定方法。
