题目

下列事实中，属于减小压强的是 A．刀刃磨得很锋利                 B．钉尖做的比较细 C．轮胎上刻有花纹                 D．载重汽车有很多轮子 答案：D All the doctors in the hospital insisted that he ____ badly wounded and that he ____ at once. A．should be; be operated on B．were; must be operated on C．was; should be operated D．was; be operated on