 |
| |||
| 通透气竖管 | |||
| 排气烟囱 | |||
| 放空立管; 放空竖管; 排气竖管; 排烟道; 通风竖管 | |||
| 泄烟道; 透气竖管; 通气主管; 通气竖管; 通气立管; 通风立管; 放散管; 放空烟道; 放空烟囱 | |||
| 通风井道; 排泄烟道 | |||
|
vent stack : 14 phrases in 2 subjects |
| Technology | 13 |
| Wind Energy | 1 |
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