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41. | micrometer spark |
| 可微调的火花隙 |
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42. | spark regulation |
| 火花调节器 |
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43. | spark technique |
| 火花法 |
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44. | Spark Program |
| "星火计划"(把先进、适用的技术引向农村的指导性科技计划,1986年经国务院批准) |
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45. | condensed spark |
| 高电容火花 |
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46. | spark shadowgraph |
| 电花图 |
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47. | spark intensifier |
| 火花增强器 |
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48. | condenser spark |
| 电容火花 |
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49. | spark photograph |
| 闪光照相 |
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50. | spark extinguisher |
| 灭火花器 |
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