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【单选题】
有意识地选取若干块水田,测算其水稻产量,研究该地区的水稻生产的经验,这种调查属于( )。A.
典型调查
B.
重点调查
C.
抽样调查
D.
普查
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皮皮学刷刷变学霸
举一反三
【简答题】这个星期天气很干燥。
【单选题】Public transit. In North America, public transportation has been the major casualty of the commitment to the automobile. Ridership on public transportation declined in the United States from 23 billio...
A.
Commuter railroad service, trolleys and buses have been reduced in the U.S.
B.
Subways have largely been maintained.
C.
Fares usually can not cover operating costs.
D.
U. S. officials think it worthwhile to subsidize public transportation.
【简答题】依照《处方管理办法》的规定，调剂处方必须做到“四查十对”，其“四查”是指 （ ）