在汤里放10克盐，要使汤的成味尝起来刚好有差异，需要增加2克盐。根据韦伯定律，如果最初放20克盐，要使汤的咸味刚好有变化，则需要加盐( )。[统考2007研]
A.2克 B.4克 C.6克 D.8克

未分类题What changes does the name College New Jersey reflect, according to the passage?A.The college has more market share than beforE.B.It is not difficult for most applicants to enter the collegE.C.The college s scope of student recruitment is enlargeD.D.The college becomes more famous than ever beforE.

未分类题女性，45岁。因发热、腹部膨隆及大便里急后重感，2周入院。体检：腹部膨隆，无腹壁静脉曲张，全腹柔韧感，有轻度压痛及反跳痛，腹水检查为血性渗出液，病理细胞未找到，粪检红细胞4 - 8／HP，白细胞2～4／HP。为明确诊断，首选的检查是