【简答题】在第六章“科学探究:摩擦力”的实验中,我们让滑块匀速运动,此时弹簧测力计的示数大小就反映滑动摩擦力的大小,这是因为什么?
【单选题】(In) his (latest) article, the reporter criticized the way (which) the racial problem was (being handled).
【单选题】一阶RL串联电路,R=25Ω、L=5mH的串联电路中时间常数为_____。
【简答题】In this article, the author relies chiefly on ______ to support his main ideas.