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81. | outer pit aperture |
| 纹孔外口 |
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82. | pumper test pit |
| 泵浦车试验槽 |
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83. | pit ?pitting corrosion |
| 点状腐蚀 |
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84. | shallow manure pit |
| 浅粪坑 |
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85. | small pit organ |
| 小窝器(鱼中的电感受器) |
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86. | meter pit flooded |
| 表井水浸 |
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87. | roll change pit |
| 换辊用坑|换辊装置安设坑 |
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88. | soaking pit crane |
| 夹钳起重机|深井炉起重机|均热炉的钳式吊车 |
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89. | section valve pit |
| 分段喉阀井;分段闸掣井 |
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90. | river crossing pit |
| 河流穿越坑 |
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