占烤瓷合金与瓷之间结合力的1/2以上的力为
A.机械结合力
B.化学结合力
C.压缩结合力
D.范德华力
E.以上都不是
参考答案:B
骨肉瘤最常见的部位是()
A.长骨的干骺端
B.颈椎
C.胸椎
D.腰椎
E.骨盆
John is the boy legs were badly hurt in the accident.
A.whose
B.that
C.who
D.which