Tietze病治疗首选()
A．抗生素的应用
B．手术切除肋软骨
C．理疗
D．对症治疗
E．以上都不是
参考答案：D
两物体放在水平桌面上，它们的质量之比为2：3，跟桌面的接触面积之比为3：2，则两物体对桌面的压力之比为 _________ ，桌面受到的压强之比为 _________ 。
You must remember ______. [ ]
A. what your teacher said
B. what did your teacher say
C. your teacher said what
D. what has your teacher said
