a.

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[医]

1. Gallium and arsenic can be removed as halide by volatilization.
   砷镓形挥除去。
2. The photographic elements contain a blue-sensitive hydrophilic colloid silver halide emulsion layer.
   照像材含体感蓝银剂层。
3. This kind of lamps is the metal-halide gasdischarge lamps designed for using in opticchemical reaction.
   碘镓应艺而设金属。