气压调压器的作用是什么？
参考答案：
控制空气压缩机的动作，调整总风缸的压强。
—Tom, _______ your T-shirt right now! It looks so dirty.
—Sorry, Mum. I was playing football the whole afternoon. [ ]
A. take off
B. take on
C. put off
D. put on
如何认识‚第三条道路的失败？
