下列“软骨黏液样纤维瘤”诊断要点中,哪项是错误的()
A.可恶变
B.青少年多见
C.长骨干骺端多见
D.单发或多发囊状透光区
E.多有砂粒样钙化
参考答案:E
— Nobody likes ,so you'd better be kind to others.
—So sorry. I won't do it again.
A. laugh at
B. to laugh at
C. to he laughed at
D. to be laughed
电压过高或过低时对三相异步电动机起动有何影响?