【判断题】In 1990, U.S. Industrial Outlook broke magazines into three broad categories: consumer magazines (65%), business publications (34%), and farm magazines (1%).
【判断题】塑件可能出现的最大误差值为δ,塑件的设计公差为Δ。必须满足δ≥Δ 。
【单选题】Which of the following is true of magazines' current situation?
A.
Magazines face pressures from the Internet only.
B.
Magazines need to spend more on the marketing.
C.
Most readers of magazines are attracted to online services.
D.
Newsstand in America plays a major role in magazine sales.
【简答题】图中零件的右端面相对φ16轴线的( )公差为0.1mm。【图片】
【简答题】图中零件的右端面相对φ16轴线的( )公差为φ0.1mm。(填写几何公差特征项目)【图片】
【单选题】Tom’s aunt bought him an interesting storybook.He wanted to . [ ]