题目内容

-What does your company do?-__________________________

A. We have 620 employees.
B. We produce motor cars.
C. We are a very large one.

查看答案

搜索结果不匹配？点我反馈

更多问题

-Could you introduce yourself?-__________________________

A. My name is Tom Ripley.
B. I cannot help but laughing.
C. I can’t find my name card.

-Could I call you for more information later on?-__________________________

A. Certainly.
B. Thank you.
C. Never mind.

为保证锁紧迅速、准确，采用了双向液压锁的汽车起重机支腿油路的换向阀应选用（）中位机能；要求采用液控单向阀的压力机保压回路，在保压工况液压泵卸载，其换向阀应选用（）中位机能。

三位四通电液换向阀的液动滑阀为弹簧对中型，其先导电磁换向阀中位必须是（）机能，而液动滑阀为液压对中型，其先导电磁换向阀中位必须是（）机能。