建立完善的食品安全标准体系，标准要涵盖从原材料进厂到生产、检验、出厂检验、销售等各个环节。
参考答案：对
— Where has Tom gone?
— He was seen _____ football on the playground a few minutes ago. [ ]
A. playing
B. play
C. to be played
D. played
特种胶轮车在大巷内行驶，重载不的超过（）km/h。
A、5
B、10
C、15
D、20
