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
Which of the following is not true of the U.S. economy?
A. It is based largely on a free enterprise system.
B. There is little government involvement in the economy
C. It is one of the least regulated economies in the world.
D. Many of the nation's basic industries are represented by only a few major corporations.
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