现代原子吸收分光光度计分光系统的组成主要是( )。
A.棱镜+凹面镜+狭缝
B.光栅+凹面镜+狭缝
C.光栅+平面反射镜+狭缝
D.光栅+透镜+狭缝
参考答案:B
But sometimes I _____________ China. [ ]
A. to
B. come
C. miss
My uncle's mum is my_____.
A. mother
B. grandfather
C. father
D. grandmother