根管长度测量时,根管长度电测仪无法准确获得根管长度的原因包括()
A.根管内有大量渗出液
B.根管侧穿或牙根折裂
C.根管内有残髓
D.测量时隔湿不当
E.以上均是
参考答案:E
Carl likes playing football ________ his brother enjoys playing the piano. [ ]
A. when
B. if
C. since
D. while
零星单项工程:人工工资在()元以下的工程。