第4题: [单项选择]电泵井测压阀的作用是()。 A. 测压 B. 开、关油套环空 C. 开关压力计 D. 与分离器配套 参考答案:B
第5题: [单项选择]The Hershey chocolate factory had been built A. 1 year later after Mr. Hershey sold the Lancaster Caramel Company. B. 3 years later after Mr. Hershey sold the Lancaster Caramel Company. C. 5 years later after Mr. Hershey sold the Lancaster Caramel Company. 参考答案:C