渐开线标准直齿圆柱外齿轮几何尺寸计算公式中，正确的是（）。
A.齿距p=2πm
B.齿厚s=πm/2
C.基圆直径db=2m.z.cosα
参考答案：B
湿热腹痛证宜选方 （）
A.大承气汤
B.玉女煎
C.龙胆泻肝汤
D.大黄黄连泻心汤
E.泻青丸
Now the Chinese eat as they actually need every day.
A．twice as much protein
B．twice protein as much
C．protein as twice much
D．protein twice as much
