液压传动中的控制元件是用来控制传动中液体的()。其中溢流阀是控制压力的,又称为(),调速阀是控制流量的,换向阀是控制的流向。
参考答案:流量、流向、压力;安全阀
阴阳相贯
根据句意及首字母提示完成单词。
1. Did Li Lei a ________ with you in the class meeting?
2. There’s n________ in her schoolbag. She looks very worried.
3. Different (不同的) countries have different c________.
4. I don’t like the i________ that students can’t wear their own clothes.
5. Most of girls like c________ clothes.