A．players B．master C．crowd D．organizer
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【单选题】根据《政府采购法》的规定，下列各项关于政府采购的表述中，正确的是()。
A. 政府采购的对象只包括货物和工程
B. 政府采购只能由集中采购机构代理
C. 政府采购只能采用公开招标的方式
D. 各级财政部门是政府采购监督管理部门
What can we learn from the text？
A. Personality decides everything.
B. Sharing is the foundation of good relationship.
C. Family members should be fans together.
D. Interest is the mother of success.
What did the man do in the bar in Germany？
A. Met his friends.
B. Attended a lecture.
C. Gave a performance.
电动机铭牌上标明型号为Yll2M一4，电源频率为50Hz，并知在额定运行条件下转差率是5%，则此电动机额定转速为（）r／min。
A. 712．5
B. 750
C. 1 425
D. 1 500
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