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| 71. | hollow preformed pile |
| 空心预制桩 |
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| 72. | adjustable hollow mill |
| 可调整空心铣刀 |
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| 73. | carbide-tipped core dril |
| 硬质合金空心钻 |
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| 74. | open block square |
| 空心矩形尺 |
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| 75. | hole profile fibre |
| 异形空心纤维 |
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| 76. | hollow heading machine |
| 空心打头机 |
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| 77. | hollow bearing pin |
| 空心销轴 |
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| 78. | herb of alligator alternanthera |
| 空心莲子草 |
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| 79. | hollow drive shaft |
| 空心驱动轴 |
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| 80. | shell and milling cutter |
| 空心端铣刀 |
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