Transmittance spectra of the heat reflector were measured （） the wavelength range of 300 nm to 2000 nm at normal incidence.
A.in
B.on
C.for
D.by
正确答案：in
Transmittance spectra of the heat reflector were measured （） the wavelength range of 300 nm to 2000 nm at normal incidence.
A.in
B.on
C.for
D.by
正确答案：in