带式输送机应加装()启动装置。
参考答案:软
应当对畜禽、畜禽产品实施追溯的情形有哪些?().
A.动物标识与畜禽、畜禽产品不符
B.畜禽、畜禽产品染疫
C.畜禽、畜禽产品没有检疫证明
D.违规使用兽药及其他有毒、有害物质
— 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