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| 51. | critical flowmeter |
| 临界流量计 |
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| 52. | gas flow indicator |
| 气体流量计 |
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| 53. | ultrasonic flowmeter |
| 超声流量计 |
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| 54. | reference flowmeter |
| 基准流量计 |
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| 55. | high sensitivity flowmeter |
| 高灵敏度流量计 |
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| 56. | interference meter |
| 干涉流量计 |
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| 57. | oxygen flowmeter |
| 氧气流量计 |
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| 58. | supersonic flowmeter |
| 超声波流量计 |
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| 59. | piezoelectric flowmeter |
| 压电流量计 |
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| 60. | resistive flowmeter |
| 电阻流量计 |
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