题型:名词解释 _______ at failing in the English exam, John wouldn't like to talk about it to his parents. [ ]A. Having disappointed B. To be disappointed C. Disappointing D. Disappointed 查看答案
题型:名词解释 某同学在课外设计了一个小实验,如图所示,扁圆柱形的钕铁硼强磁铁(S极朝上)吸住自攻螺丝的下端(螺丝下部扁平),一段软导线(多股细铜丝)的上端与电池的负极接触良好,下端像电刷似的接触圆柱形磁铁侧壁,则螺丝和磁铁便一起绕中心竖直轴转动起来,设电源电动势为E,电路总电阻为R,下列判断正确的是( )A.俯视螺丝逆时针快速转动,回路中电流I=ERB.俯视螺丝顺时针快速转动,回路中电流I<ERC.俯视螺丝逆时针快速转动,回路中电流I<ERD.俯视螺丝顺时针快速转动,回路中电流I=ER 查看答案