第2题: [单项选择]火箭免疫电泳中,抗原、抗体的泳动方向是() A. 琼脂凝胶中的抗体不移动,样品孔抗原向阳极泳动 B. 琼脂凝胶中的抗体不移动,样品孔抗原向阴极泳动 C. 琼脂凝胶中的抗原不移动,样品孔抗原向阳极泳动 D. 琼脂凝胶中的抗原不移动,样品孔抗原向阴极泳动 E. 抗原、抗体均向正极泳动 参考答案:A
第9题: [单项选择]血钙离子低于多少可以引起婴儿手足搐搦发作() A. 1.0mmol/L(4mg/dl) B. 1.75mmol/L(7mg/dl) C. 1.88mmol/L(7.5mg/dl) D. 2.25mmol/L(9mg/dl) E. 1.38mmol/L(5.5mg/dl) 参考答案:A
A. always keeps an open mind to history B. looks at one historical event without relating it to another C. sees things from a single point of view D. refuses to accept new evidence 参考答案:A 答案解析:本文第一段就提出“To be“historically minded” is to see things in relation and in perspective;We must always k