题型:填空题 如图所示,在匀强电场中有a、b、c三点,a、b相距 4cm,b、c相距10cm,ab与电场线平行,bc与电场线成60°角.将一个带电荷量为+2×10-8C 的电荷从a点移到b点时,电场力做功为4×10-6 J.则a、b间电势差为______V,匀强电场的电场强度大小为______V/m,a、c间电势差为______V. 查看答案
题型:选择题 Managing money has long been a headache for students mostly supported by their family, who find it ________ to deal with their finances.A.challengingB.rewardingC.demandingD.exciting 查看答案