测量电容器绝缘电阻()应注意放电,以防作业人员触电。
A.前
B.后
C.前后
参考答案:C
─What are you reading, Jane?
─Some books on ________ education, I’m now interested in ________ education of young people.
A.an; the
B./; the
C.the; an
D.an;/
不属于口腔颌面部后天畸形和缺损的病因的是()
A.肿瘤
B.结核
C.交通事故
D.颌骨发育畸形
E.放射性骨坏死