“我自横刀向天笑，去留肝胆两昆仑”。此话出自[ ]
A．康有为
B．梁启超
C．谭嗣同
D．宋教仁
答案：C
与牙槽嵴吸收速度和量无关的因素是
A．骨质的疏密程度B．颌弓的大小C．缺牙的原因D．全身健康状况E．戴义齿的适合性
Neglecting friction, you desire to life a 300 kgs weight with a stress on the hauling part of 100kgs.Which of the following tackles would you use ?（）.
A.Gun tackle
B.Luff tackle
C.Toe-fold tackle
D.Double-luff tackle
