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water fire extinguishing system | |||
water extinguishing system | |||
water fire-extinguishing system | |||
| |||
water monitor system |
水 灭火系统 : 52 phrases in 9 subjects |
Exhibitions | 1 |
Hydroelectric power stations | 2 |
Nautical | 14 |
Oil / petroleum | 3 |
Rail transport | 1 |
Shipbuilding | 2 |
Space | 1 |
Technology | 27 |
United Nations | 1 |