photoconductor
(1)光电导体
(2)光敏电阻

• Helmholtz equation
• Helmholtz-Ketteler formula
• helmholtz reciprocal relationship
• Helmholtz reciprocity law
• Helmholtz's reciprocity theorem
• Helmholtz telesterscope
• hemeralopia
• hemianopsia
• hemiconcentric resonator
• hemiconfocal resonator
• hemicrystalline
• hemi-ellipsoidal mirror
• hemihedral field
• hemihedry
• hemisphere
• hemispheric
• hemispherical candle power
• hemispherical cavity
• hemispherical inmmerison lnes
• hemispherical integration
• hemispherical mirror
• hemispherical resonator
• hendecagon
• he-Ne Lasers
• henry