fewer than 17,000 TV sets. Three years later, consumers werebuying 250,000 sets a month, and by 1960 three-quarters of allfamilies owned at least one set. In middle of the decade, the9.__________
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average family watched television four to five hours a day.Americans of all ages grew exposed to increasingly sophisticated10._________advertisements for products said to be necessary for the good life.
已知某工程300m3砼需50个工日完成,其产量定额为
A. 2 m3/工日
B. 2
C. 6 m3/工日
D. 0.5
已知某工程200立方米需100个工日完成。其时间定额为
A. 0.5工日/立方米
B. 1.1工日/立方米
C. 1.2立方米/工日
D. 2立方米/工日
用计时观测法编制施工定额时、其研究对象是
A. 施工动作
B. 施工操作
C. 施工过程
D. 工序