某试液用1cm比色皿测得透光率为T,若用2cm比色皿测定时,透光率的变化将是()
A.增加
B.减小
C.不变
D.提高1倍
E.降低1/2
参考答案:B
----- Did your father go to America?
----- No, his boss suggested that he _____ there.
A.not go
B.didn’t go
C.wasn’t going
D.not to go
A.θ1=30°,θ2=30°
B.θ1=30°,θ2=60°
C.θ1=60°,θ2=30°
D.θ1=60°,θ2=60°