The humidifier’s valve of air-condition should be （）, when the temperature is lower than 0℃.

The humidifier’s valve of air-conditioner should be （）,...

单项选择题The humidifier’s valve of air-conditioner should be （）, when the temperature is 5~8°C in the winter.

In the management of the shafting, because（） carry heav...

单项选择题In the management of the shafting, because（） carry heavy load and caused high temperature easily, it should be paid attention.

In the shafting management （） should be paid more atten...

单项选择题

In the shafting management （） should be paid more attention.
Ⅰ.f the while metal tailshaft bearing is dripping oil
Ⅱ.f some area become blue during the running
Ⅲ.he deformation of crankshaft