Pigeons have been known to fly as fast as _____. A: 75 mph B: 50 mph C: 110 mph D: 62 mph

A car travels 20 miles at 30 mph, then 10 miles at 60 mph. What is the mean speed for the whole journey of 30 miles A: 36 B: 40 C: 42 D: 45

According to the passage, mailsters were likely to tip over because______. A: even large dogs could cause this to happen B: they had 3 wheels C: the mail could shift in the van when cornering over 25 mph D: of cars lined up behind them

预测控制是近年来出现的集中不同名称的新型控制系统的总称，它包括( )。 A: 模型预测启发式控制(MPH B: 静态矩形控制(DN C: 动态矩形控制(DM D: 模型算法控制(MA