He didn't pass the exam_____ he had stud 发布时间:2017-06-21 22:34 │ 来源:www.tikuol.com 题型:选择题 问题: He didn't pass the exam _____ he had studied harder.[ ]A. because B. but C. even if D. if
题型:选择题 After spending a wonderful weekend, Jim would have to return to his ________ duties on Monday.A.commonB.normalC.regularD.usual 查看答案
题型:选择题 如图所示为一种自动跳闸的闸刀开关,O是转动轴,A是绝缘手柄,C是闸刀卡口,M、N接电源线,闸刀处于垂直纸面向里、磁感应强度B=1T的匀强磁场中,CO间距离为10cm。当磁场力为0.2N时,闸刀开关会自动跳开。则要使闸刀开关能跳开,CO中通过的电流的大小和方向为 [ ]A.电流方向C→OB.电流方向O→CC.电流大小为1A D.电流大小为0.5A 查看答案