公式A=-LgT=ECL中,A、T、E、C、L分别表示 A. A-吸光度、T-透光率、E-吸收系数、C-待测物浓度、L-液层厚度 B.A-吸光度、T-光源、E-吸收系数、C-待测物浓度、L-光路长度 C.A-透光率、T-吸收度、E-吸收系数、C-待测物浓度、L-液层厚度 D.A-吸光度、T-透光率、E-能量、C-浓度、L-光路长度 E.A-透光率、T-吸收度、E-光波长度、c-浓度、l-吸收系数
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【单选题】According to the article, what is a numbers station? a kind of radio station that unusual music and songs a kind of radio station that transmits strange sounds and signals a kind of radio station that...
A.
a kind of radio station that unusual music and songs
B.
a kind of radio station that transmits strange sounds and signals
C.
a kind of radio station that broadcasts news about secret messages
D.
a kind of radio station that helps people solve difficult math problems