特、一等站站名标志应有照明装置,能昼夜显示。
参考答案:对
_______money, the boy had to give up school to support his poor family. [ ]
A. Lacked
B. Lacking of
C. Lacking
D. Lacked of
理想根管消毒药应具备的条件不包括()
A.杀菌力强
B.性能稳定
C.渗透性不能强
D.不使牙齿染色
E.不刺激根尖周组织