题目

Livestreaming(直播) is turning out to be quite a big trend. From playing video games to dancing to K-pop, streamers are making big money simply by sharing their daily lives with the world. Some streamers even become world-famous, especially e-sports players like Shroud and Ninja.I don’t really watch a lot of livestreams. When it comes to gaming, I’d rather play video games myself than watch someone else play them. But I understand that some gamers might watch them to pick up playing tips.Sometimes livestreaming is a bit vain. A lot of streamers are just doing it for the attention. That b某同学用伏安法测一节干电池的电动势和内阻，现备有下列器材：A．被测干电池一节B．电流表1：量程0～0．6 A，内阻r=0．3ΩC．电流表2：量程0～0．6 A，内阻约为0．1ΩD．电压表1：量程0～3 V，内阻未知E．电压表2：量程0～15 V，内阻未知F．滑动变阻器1：0～10Ω，2AG．滑动变阻器2：0～100Ω，1AH．开关、导线若干伏安法测电池电动势和内阻的实验中，由于电流表和电压表内阻的影响，测量结果存在系统误差，在现有器材的条件下，要尽可能准确地测量电池的电动势和内阻。（1）在上述器材中请选择适当的器材（填写器材前的字母）：电流表选择__________，电压表选择 ，滑动变阻器选择 。（2）实验电路图应选择下图中的__________（填“甲”或“乙”）；（3）根据实验中电流表和电压表的示数得到了如图丙所示的U－I图象，则在修正了实验系统误差后，干电池的电动势E＝__________V，内电阻r＝__________Ω。