内听道扩大为两侧内耳道宽径相差超过()
A.2mm
B.5mm
C.7mm
D.4mm
E.6mm
参考答案:A
19.He says he really can’t _____ to wait another day.
A.waste
B.afford
C.spare
D.Pay
许速度υmax≤120㎞/h正线及到发线,43kg/m钢轨垂直磨耗超过()判重伤。
A、8mm
B、9mm
C、10mm
D、11mm