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听力原文： American Coast Guard officials in Florida say they returned to Cuba a group of would-be migrants who tried to make their way to the United States in an unusual vessel--a floating truck. They said one of their planes spotted the Cubans more than half way through their journey and the coast guards could not believe their eyes when they saw the vessel. The Cubans had attached floats and a propeller to a 1951 Chevytruck. What happened to the Cubans?A.
They set foot in Florida.
B.
They drowned off the coast of Florida.
C.
They were taken into custody.
D.
They were sent back to Cuba.
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【简答题】Che cosa (voi fare) domenica?
【简答题】Voi che cosa /fare/ ________________ stasera?
【简答题】平面运动副按组成运动副两构件的接触特性,分为____和____两种。其中两构件间为面接触的运动副称为____;两构件间为点或线接触的运动副为____。若引入一个高副将引入____个约束,引入一个低副将引入____个约束。
【简答题】有源二端网络A的实验电路如图(1)所示，求戴维南等效电路及其参数，并进一步计算出通过20Ω电阻的电流和它消耗的功率，如图(2)所示。
【单选题】运动副有多种分类方法，按照运动副的接触形式分类，面和面接触的运动副在接触部分的压强较低，被称为（），而点、线接触的运动副称为（）。
A.
高副；低副
B.
低副；高副
C.
接触副；点线副
D.
面副；点副
【简答题】有源二端网络A的实验电路如图(1)所示，求戴维南等效电路及其参数，并进一步计算出通过20Ω电阻的电流和它消耗的功率，如图(2)所示。
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