旋压密封式制动缸缸体内径磨耗大于（）时更换。
A.1mm
B.2mm
C.3mm
D.4mm
参考答案：B
_____, sometimes I am very clumsy and drop things or bump into furniture.
A．In addition to
B．Except for
C．What more
D．In addition
腹股沟直疝环的底边为
A．腹股沟韧带
B．耻骨梳韧带
C．陷窝韧带
D．腹壁下动脉
E．腹直肌外侧缘
