流通加工的服务质量衡量标准是______。
A．产品增值率 B．成本目标 C．运输能力 D．用户的满意程度
参考答案：D
---- Mr. Smith is said to have retired and he is living in the country now.
---- Yes. He ________ in our factory for 35 years! What a good worker!
A．had been working
B．had worked
C．worked
D．have worked
CRH1A型动车组网侧变流器的在启动过程中对中间环节电容器进行了（）个阶段的充电。
A.1
B.2
C.3
D.4
