【简答题】When the market crashed, the prices of tulips fell by ______ percent of the highest prices.
【单选题】Prices of daily goods ___________ online can be lower than store prices.
【单选题】一质点沿半径为 R=0.1m 的圆周运动,其角位移θ可用下式表示: θ =2+4t 2 (SI) .当 切向加速度大小恰为总加速度 大小的一半时, ,其角位移 θ =
【单选题】一质点沿半径R=0.1m的圆周运动,其角位移θ可用θ=2+4 (SI)表示,(1)则当t=2s时,切向加速度=_______;(2)切向加速度大小为总加速度大小的一半时,θ=________。 上述两空正确的答案是下列哪个?
【简答题】Rising prices are per______ as a threat to living standards, so that the faster prices are increasing, the more likely are workers to join a union in order to maintain their standards of living.