什么叫机车车辆的换算长度?
参考答案:
机车、车辆长度的计算,以前后两钩舌内侧面距离按11m为换算单位(1辆),各型机车、车辆按上述换算单位得出的比值,称为换具长度。
There is a mountain___the top is always coveredwith snow.[ ]
A. of that
B. of which
C. its
D. that
正常心电轴范围为()?
A.-30°~-90°
B.-30°~+90°
C.0°~+90°
D.-30°~0°