请教一道物理题（抄袭,灌水勿入,在静电场中,将一正电荷从a点移到b点,电场力做了负功,则(　　)A．b点的电场强度一定比a点大B．电场线方向一定从b指向aC．b点的电势一定比a点高D．该电荷的

请教一道物理题（抄袭,灌水勿入,在静电场中,将一正电荷从a点移到b点,电场力做了负功,则(　　)A．b点的电场强度一定比a点大B．电场线方向一定从b指向aC．b点的电势一定比a点高D．该电荷的 请教一道减数分裂的题（灌水,抄袭勿入谢谢）第9题,请问怎么判断谢谢 请教一道生物题（灌水抄袭勿入谢谢）http://wenku.baidu.com/link?url=eSam3QYV5c_HVKWsm6MjEKCtre2bi-GXVVRryGILHknZsFJGpZf11B1zG8Hz2Jlf4FLG7V5EpqbiIwMrBrAgvVyrDFNY8utG0AS236Z2AQW第9题,请问怎么判断谢谢 请教一道物理题（抄袭灌水勿入谢谢）其中A选项,θ增大,那么是传送带的长度不变,即C的高度也增大,还是C的高度不变,传送带长度减小?物块可能一直匀加速,也可能先匀加速,后匀速. 请教一道英语选择题（灌水,抄袭勿入,The south was attacked by such a big sonw___few people had ever experienced before.A.as B.and C.that D.which 请教一道英语题（灌水抄袭勿入,What we have said ________ her so happy.A.makes B.to makeC.made D.has made请问其它选项为什么不对, 请教一道物理题（灌水勿入,按下列要求设计一个变压器：在同一闭合铁芯上绕三个线圈,甲线圈接220V照明电源,乙线圈要求输出36V电压和100W额定功率,丙线圈要求输出6V电压和10W额定功率．乙 请教一道英语选择题（灌水,抄袭勿入,—I think 20 dollars for it is OK.—No,I’d gladly pay _____ for it.A.twice as much B.three times of what C.the price twice D.as much three times 紧急求助物理题在线等（灌水,抄袭勿入,谢谢）如图,O是一固定的点电荷,另一点电荷P从很远处以初速度v0射入点电荷O的电场,仅在电场力作用下的运动轨迹如曲线MN所示.a、b、c是以O为中心、Ra 请教英语问题（灌水,抄袭勿入,谢谢）Today I habe to go to work by bus because my car___ at the garage.为什么选is being repaired而不选has been repaired? 请教一道高一物理题! 一道大学物理题,真空中的静电场怎么考虑? 紧急求助物理题（灌水,抄袭勿入,谢谢）请问这个题目我电场线有没有画错?我觉得应该是这样画的,否则没法垂直,但是这个题目的B选项,答案的解析说“由电场线分布情况可知a点场强小于b点 请教一个英语选择题（抄袭,灌水勿入,Mark was a student at this university from 1999 to 2003,_____ he studied very hard and was made chairman of the Students’ Union.A.during which time B.for which time C.during whose time D.by that tim 请教一道电学方面的物理题 一道物理题,图在 请教一道英语选择题（灌水勿入）-Shall we go out for a meal tonight?-__________.We haven’t been out for ages.A.No bother B.That’s all right C.Not really D.I’d love to请问BD改选哪个？为什么？ 一道大学物理题,真空中的静电场我感觉是0··但答案不是i?