原子荧光法的分析项目是()。
A、Hg、Mg、As
B、Hg、As、Se
C、Hg、As、Sb
D、Hg、As、Ca
参考答案:B, C
Let Harry play with your toys as well,Clare— you must learn to __________.
A.support
B.care
C.spare
D.share
串联谐振时也叫电压谐振。( )