单项选择题

A.制动踏板 — 制动总泵 — 制动器管路 — 制动助力器 — 制动片
B.制动踏板 —制动助力器— 制动总泵 — 制动器管路 — 制动片
C.制动踏板 — 制动总泵 —制动助力器— 制动器管路 — 制动片
D.制动踏板 — 制动器管路 —制动助力器— 制动总泵 — 制动片