题目内容

and economic patterns. Developing in the 1930s, it was not widely7.__________

查看答案

搜索结果不匹配？点我反馈

更多问题

marketed until after the war. In 1946 the country had about8.__________

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.__________

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