【简答题】What did the teacher think of Robby when he began his piano lessons?
【判断题】电感线圈两端电压为零时,其储能一定为零。()
【单选题】What should the teacher think about when he/she makes a lesson planning?
B.
materials to be covered and activities to be organized
C.
techniques and resources to be used in order to achieve the aims
【单选题】(1)铝盐药物的测定常用配位滴定法。加入过量EDTA,加热煮沸片刻后,再用标准锌溶液滴定。(2)用 Na 2 CO 3 基准物标定HCl标准溶液的准确浓度。采用的滴定方式分别是( )
【简答题】流过电容器和电感线圈的电流与其两端电压的关系分别表示为 , 式中,C和L为常数,试说明电容器和电感线圈是线性元件。
【简答题】某电感线圈,接到120V的直流电源上测得电流I=20A;接到频率f=50Hz,电压220V的交流电源上,测得电流I=28.2A。求线圈的电阻R和电感L。
【单选题】关于DIC的治疗,下列哪项治疗原则是正确的?