搜题请搜索小程序“爱下问搜题”
问题 单项选择题

襟翼驱动系统供压管路上优先活门的作用是在供压低于2400PSI时（）

A.优先向液压马达供压

B.切断向前缘装置作动筒的供压

C.优先向扰流板作动筒供压

D.优先向前缘装置作动筒供压

答案

参考答案：D

填空题
从方框中选择合适
bit, dialogue, servant, superb, impress
1. The children gave a _____ performance.
2. He has worked as a _____ for the family for ten years.  
3. There will be a friendly _____ between the two countries.
4. I was very _____ by what a good writer he was.
5. The best _____ of the movie is that the two lovers get together after two years' waiting.
查看答案
选择题

如图表示的是在CO2浓度为1%和0.03%两种情况下，某农作物的光合作用强度与光照强度之间关系曲线图．据图分析，限制图中Q点光合作用的因素是（　　）

①CO2浓度，②光照强度．

A．①

B．②

C．①和②

D．与①②无关
查看答案