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51. | condensed spark |
| 高电容火花 |
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52. | spark quenching |
| 电火花淬火 |
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53. | spark suppressor |
| 火花抑制器 |
|
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54. | spark photograph |
| 闪光照相 |
|
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55. | spark telegraphy |
| 火花电报 |
|
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56. | spark technique |
| 火花法 |
|
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57. | discharge spark |
| 放电火花 |
|
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58. | spark intensifier |
| 火花增强器 |
|
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59. | spark regulation |
| 火花调节器 |
|
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60. | spark shadowgraph |
| 电花图 |
|
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| |