小小变色龙(多音字组词)。
更 gēng( ) 调 diào( ) 尽 jǐn( )
gèng( ) tiáo( ) jìn( )
三更 更好 调查 调节 尽管 尽力
(答案不唯一)
In western culture,21 was the age________ young people traditionally received a key to their parents’ door, as a symbol of entering adulthood.
A.in which
B.on which
C.at which
D.to which
美国科学家Willard S.Boyle与George E.Smith 因电荷耦合器件(CCD)的重要发明荣获2009年度诺贝尔物理学奖。CCD是将光学量转变成电学量的传感器。下列器件可作为传感器的有
A.发光二极管 B.霍尔元件
C.定值电阻 D.干电池