恶性卵巢肿瘤的主要转移途径为() A.直接蔓延和腹腔种植 B.腹腔广泛种植 C.经淋 发布时间:2017-09-09 23:14 │ 来源:www.tikuol.com 题型:单项选择题 问题: 恶性卵巢肿瘤的主要转移途径为()A.直接蔓延和腹腔种植B.腹腔广泛种植C.经淋巴转移D.经血行转移E.血行与淋巴转移为主
题型:单项选择题 如图所示,在x轴上方存在着垂直于纸面向里、磁感应强度为B的匀强磁场,一个不计重力的带电粒子从坐标原点O处以速度v进入磁场,粒子进人磁场时的速度方向垂直于磁场且与x轴正方向成120°角,若粒子穿过y轴正半轴后在磁场中到x轴的最大距离为a,则该粒子的比荷和所带电荷的正负是( )A.,正电荷B.,正电荷C.,负电荷D.,负电荷 查看答案
题型:单项选择题 Serving is().A.marline or ratline wound along the grooves of a ropeB.narrow strips of light canvas or cotton cloth spiral-wrapped along the ropeC.marline tightly wound on the rope by means of a board or malletD.a splice made by laying the strand of one rope into the vacated grooves of another rope 查看答案