常見例句雙語例句A one-way valve is installed on the oil outlet pipe, and the utility model has the advantages of simple structure, rapid discharge and suction, convenient operation and low cost.在出油管路上裝有一個單向閥。本吸油器的優(yōu)點是結(jié)構(gòu)簡單、排吸快、使用方便、成本低。ip.com 返回 oil discharge outlet