... 双官能引发剂 bifunctional initiator 双管空气调节系统 dual duct air conditioning system 双光束分光光度计 double beam spectrophotometer ...
2
?双风道空调系统
...双风道空调系统 double duct air-conditioning system; double-duct air conditioning system; dual duct air conditioning system 双峰值线形状 double peaked line shape ..