常用眼膏剂基质中有表面活性作用、具有较强的吸水性和黏附性的是
A.凡士林
B.硬脂酸
C.羊毛脂
D.液状石蜡
E.石蜡
参考答案:C
______ to his work, the scientist didn't get married all his life. [ ]
A. Devoting
B. To devote
C. Devote
D. Devoted
电务人员检修闭塞设备需要使用事故按钮时,不需请求调度命令,但是电务与车站必须在《行车设备检查登记簿》内办理登记和签认手续,()发生变化时,应予注明。