食品生物性污染包括
A. 寄生虫及虫卵
B. 昆虫
C. 细菌及其毒素
D. 农药及兽药
E. 霉菌及其毒素
污染食品的常见细菌包括
A. 乳杆菌属
B. 假单胞菌属
C. 微球菌属
D. 肠杆菌属
E. 芽孢杆菌属
总风无压力空气的情况下,要缓解机车弹停装置,必须( )。
A. 按压司机室弹停装置缓解按钮
B. 按压气阀柜弹停模块上的缓解脉冲电磁阀
C. 手拉4个弹停风缸的缓解拉杆
he following are the factors that have contributed to the development ofthe U.S. economy except ______.
A. the vast space and resources of the land
B. the ideals of freedom and economic opportunity
C. English as its national language
D. hard work by the people