空压机是（）。
A、气压发生装置
B、气压辅助元件
C、气压控制元件
D、用来控制压缩空气压力的装置
参考答案：A
Judging from his _______ look, I know it is a very _____ situation to her.
A．confused; confused
B．confusing; confusing
C．confusing; confused
D．confused; confusing
支架的制做与安装有哪些注意事项？
