15-21/GHC-DT1U1B2/2T 15-21/GHC-R1S1/2T 15-21/GHC-R2S2/2T 15-21/GHC-R2S2/2T 光电、光敏传感器 15-21/GHC-XS1T1/2T 15-21/GHC-XS1T1/3T 15-21/GHC-YB1S2/3F 15-21/GHC-YP2R1KY/2T 15-21/GHC-YP2R1KY/3T 15-21/GHC-YR1S1/2T