主减速器主动轴中心线低于后桥中心线的是（）齿轮。
参考答案：准双曲面
铁锈色痰常见于
A．慢性支气管炎B．大叶性肺炎C．肺脓肿D．肺结核E．支气管扩张
—What's name?
— name's Nick. [ ]
A. my, My
B. your,Your
C. his, His
D. her, His
