I was born ______ the morning of July 1st, 1996.
A.in
B.at
C.on
D.for
答案:C
具体到某一天的某个时间要用介词on
下列物质中属于非电解质的是( )
A.I2
B.NO2
C.铁
D.氯化铵
脊髓表面纵行的沟有_______,_______,_______,和_______。