某带正电的点电荷形成的电场中，三个等势面用同心环状虚线a、b、c表示，如图所示，另一个带电粒子仅在该电场力作用下，沿着经过K、L、M、N点的径
The book might be my sister's. Hemingway is________ favorite author. A. his B. her C. my
p{font-size:10.5pt;line-height:150%;margin:0;padding:0;}td{font-size:10.5pt;}（08长春市一调）在用酵母菌酿酒时，如果向酿酒的原料中通入足量的02，会出现的现象是
—Mike, would you mind not wearing those old jeans? They look terrible. —__________ . A．Sorry. I won’t be long B．Sure. I’ll do
Alibaba started taking the lead in China by connecting big Chinese manufacturers (制造商) with big buyers across the world. Its business-to-business site, Alibaba.com allowed business to buy alm
中小企业是我国最具活力的企业群体，在GDP中的比重约为60%,提供了约70%的城镇就业岗位。自2011年以来,受需求不足、成本上升等不利因素的影响,中小企
三脚插头中与用电器金属外壳相连接的插脚比另外两个稍长，这样做是为了A．使插头的造型更美观B．插入插座中更稳固C．有利于区分火线与零线插脚D
