皮皮学，免费搜题
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搜题
【单选题】
本机制粉系统的类型是()A.
中速磨，中储式制粉系统
B.
中速磨，直吹式制粉系统
C.
低速磨，中储式制粉系统
D.
低速磨，直吹式制粉系统
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皮皮学刷刷变学霸
举一反三
【单选题】All of the following are the characteristics of the inquiries mentioned in the second paragraph except ______.
A.
a large number of questionnaires were sent out
B.
quantity rather than quality was emphasized
C.
almost no effort was made to interview people from every walk of life
D.
every publication in America got involved