压制动踏板高度很低，连续踩踏板，踏板逐渐升高，其原因之一是（）。
A、制动器蹄片与制动鼓间隙过大
B、主缸皮碗踏翻
C、制动管路开裂
参考答案：A
Please come and help me with this application form because I don't know how to________it.[ ]
A. set about
B. set out
C. set up
D. set aside
引起核黄疸的血清胆红素浓度一般超过（）
A.10mg/dl
B.12mg/dl
C.15mg/dl
D.20mg/dl
E.25mg/dl
