骨肉瘤主要的X线表现是（）
A.瘤骨形成
B.骨质破坏
C.骨膜反应
D.软组织肿胀
E.以上都不是
参考答案：A
A quarrel broke out between him and his cousins，which made him_________ them．
A．1ive up to
B．break away from
C．take the place of
D．lose sight of
紫铜垫使用前要先经退火软化。
